{"id":3304,"date":"2010-07-11T06:43:16","date_gmt":"2010-07-11T06:43:16","guid":{"rendered":"http:\/\/pchero21.com\/?p=903"},"modified":"2010-07-11T06:43:16","modified_gmt":"2010-07-11T06:43:16","slug":"12-%ed%8f%ac%ed%8a%b8-%eb%85%b8%ed%82%b9%ea%b3%bc-%eb%8b%a8%ec%9d%bc-%ed%8c%a8%ed%82%b7-%ea%b6%8c%ed%95%9c-%eb%b6%80%ec%97%ac","status":"publish","type":"post","link":"http:\/\/pchero21.com\/?p=3304","title":{"rendered":"12.\ud3ec\ud2b8 \ub178\ud0b9\uacfc \ub2e8\uc77c \ud328\ud0b7 \uad8c\ud55c \ubd80\uc5ec"},"content":{"rendered":"

 * \uacf5\uaca9 \uc218\ub2e8 \ucd95\uc18c<\/span><\/p>\n

 IDS\uc5d0 \uc758\ud574 \uac10\uc2dc\ub418\ub294 \uc2a4\ud478\ud551\ub41c \uacf5\uaca9\uc740 \uae0d\uc815 \uc624\ub958\ub97c \uc0dd\uc131\ud558\uc9c0 \ubabb\ud558\uba70, \uae30\ubcf8 \ubc84\ub9ac\uae30 \ud328\ud0b7 \ud544\ud130 \ub54c\ubb38\uc5d0 \uc138\uc158\uc774 \uc22b\ub9bd\ub420 \uc218 \uc5c6\uc73c\ubbc0\ub85c \uc218\ub9bd\ub41c TCP \uc138\uc158\uc744 \ud1b5\ud574 \uc2e4\uc81c \uacf5\uaca9\uc744 \uc804\ub2ec\ud558\ub824\ub294 \uc2dc\ub3c4\ub3c4 \uc2e4\ud328\ud55c\ub2e4. \uadf8\ub7ec\ubbc0\ub85c \ud3ec\ud2b8 \ub178\ud0b9\uacfc SPA\ub294 \ub124\ud2b8\uc6cc\ud06c \uc11c\ube44\uc2a4\uc5d0 \ub300\ud574 \uacf5\uaca9\uc744 \uac00\ud560 \uc218 \uc788\ub294 \uc218\ub2e8\uc744 \uac10\uc18c\uc2dc\ud0a8\ub2e4. iptables \uac00 \uc81c\uacf5\ud558\ub294 \uae30\ub2a5\uc744 \ud1b5\ud574 \ud6a8\uacfc\uc801\uc778 \ud3ec\ud2b8 \ub178\ud0b9\uacfc PSA \uc2dc\uc2a4\ud15c\uc744 \uc27d\uac8c \uad6c\ud604\ud560 \uc218 \uc788\ub2e4. SSHD\uc640 \uac19\uc740 \uc11c\ube44\uc2a4\uc5d0 \uc774\ub807\uac8c \ucd94\uac00\uc801\uc778 \ubcf4\uc548 \uacc4\uce35\uc744 \ucd94\uac00\ud568\uc73c\ub85c\uc368 \uc2dc\uc2a4\ud15c\uc774 \uce68\ud22c\ub418\uc9c0 \uc54a\uace0 \uc548\uc804\ud55c \uc0c1\ud0dc\ub85c \uc720\uc9c0\ub418\uac8c \ud560 \uc218 \uc788\ub2e4.<\/p>\n

 * \uc81c\ub85c \ub370\uc774 \uacf5\uaca9 \ubb38\uc81c<\/span><\/p>\n

 Bugtraq, \ud480-\ub514\uc2a4\ud074\ub85c\uc800, Vuln-dev \uba54\uc77c\ub9c1 \ub9ac\uc2a4\ud2b8\ub294 \ub9e4\uc6b0 \ud65c\ubc1c\ud558\uba70, \ucd5c\uc2e0 \uacf5\uaca9 \uae30\uc220\uc5d0 \ub300\ud574 \uc544\uc8fc \ud6cc\ub96d\ud55c \uae30\uc220 \uc815\ubcf4\uc640 \ub17c\uc758\ub97c \uc81c\uacf5\ud55c\ub2e4. \ud68c\uc0ac \uc804\uccb4(\uc608\ub97c \ub4e4\uc5b4 iDefense, http:\/\/idefense.com \ucc38\uc870)\uac00 \ucde8\uc57d\uc810 \ucd94\uc801\uc5d0 \uae30\ubc18\ud55c \uc0ac\uc5c5 \ubaa8\ud615\uc744 \uac00\uc9c0\uace0 \uc0ac\uc6a9\uc790\ub97c \uc704\ud55c \ucde8\uc57d\uc810 \uc870\uae30 \uacbd\uace0 \uc2dc\uc2a4\ud15c\uc744 \uc81c\uacf5\ud558\uae30\ub3c4 \ud55c\ub2e4. iDefense \ub294 \uc0c8\ub85c\uc6b4 \ucde8\uc57d\uc810\uc744 \ubc1c\uacac\ud55c \uc0ac\ub78c\uc5d0\uac8c \ub3c8\uc744 \uc9c0\ubd88\ud558\uace0 \uc790\uc2e0\uc774 \ucde8\uc57d\uc810\uc744 \uba3c\uc800 \uacf5\uac1c\ud560 \uad8c\ub9ac\ub97c \uc0ac\uae30\ub3c4 \ud55c\ub2e4.<\/p><\/blockquote>\n

\uc0c1\uc6a9\uc73c\ub85c \uac1c\ubc1c\ub418\ub294 \ub300\ubd80\ubd84\uc758 \uc18c\ud504\ud2b8\uc6e8\uc5b4\ub294 \ubcf4\uc548\uc774 \uc544\ub2c8\ub77c \uc774\uc775\uc744 \uadf9\ub300\ud654\ud558\ub824\ub294 \uace0\uac1d\uc744 \uc704\ud574 \uac1c\ubc1c\ub41c\ub2e4. \uadf8\ub7ec\ub098 \ud53c\uc2f1(phishing), \uc2a4\ud30c\uc774\uc6e8\uc5b4, \uc2e0\uc6d0 \ub3c4\ub09c, \ub9c8\uc774\ud06c\ub85c\uc18c\ud504\ud2b8 \uc2dc\uc2a4\ud15c\uc744 \ubaa9\ud45c\ub85c \ud558\ub294 \ud2b9\ud788 \uce58\uba85\uc801\uc778 \uc6dc(\ucf54\ub4dc \ub808\ub4dc\uc640 SQL \uc2ac\ub798\uba38 \ub4f1)\uacfc \uac19\uc774 \ubcf4\uc548 \ubb38\uc81c\uc758 \ubd84\ub958\uac00 \uc138\ubd84\ud654\ub428\uc5d0 \ub530\ub77c \ud68c\uc0ac\ub4e4\uc774 \ubcf4\uc548\uc744 \uac15\uc870\ud558\uae30 \uc2dc\uc791\ud588\ub2e4.<\/p>\n

 \uadf8\ub807\ub2e4\uba74 \ud55c\uac00\uc9c0 \uc758\ubb38\uc810\uc774 \ub4e0\ub2e4. \uc65c \uc774\ub807\uac8c \ubcf4\uc548 \ucde8\uc57d\uc810\uc774 \ub9ce\uc740\uac00?<\/p>\n

 – \uc18c\ud504\ud2b8\uc6e8\uc5b4\ub294 \ud56d\uc0c1 \uad6c\ud604\uc5d0 \ub530\ub77c \ub2ec\ub77c\uc9c0\uba70 \uc18c\ud504\ud2b8\uc6e8\uc5b4\uac00 \uc548\uc804\ud558\ub2e4\ub294 \uac83\uc744 \uc5c4\ubc00\ud788 \uc99d\uba85\ud574\uc8fc\ub294 \ubc29\ubc95\uc740 \uc874\uc7ac\ud558\uc9c0 \uc54a\ub294\ub2e4. \uad6c\ud604\uc0c1 \ubc84\uadf8\ub85c \uc778\ud574 \uc774\ub860\uc801\uc73c\ub85c \uc548\uc804\ud55c \uc18c\ud504\ud2b8\uc6e8\uc5b4 \uc124\uacc4\uac00 \ubcf4\uc548 \ubb38\uc81c\uc5d0 \ub178\ucd9c\ub420 \uc218 \uc788\ub2e4.<\/p>\n

 – OpenSSH \ud504\ub85c\uc81d\ud2b8(http:\/\/www.openssh.org \ucc38\uc870)\ub97c \uc0b4\ud3b4\ubcf4\uc790. OpenSSH\ub294 \uc138\uacc4\uc5d0\uc11c \uac00\uc7a5 \uc608\ub9ac\ud558\uba70 \ubcf4\uc548\uc744 \uace0\ub824\ud558\ub294 \uac1c\ubc1c\uc790\ub4e4\uc774 \uc791\uc131\ud558\uc9c0\ub9cc \uc774\ub7f0 OpenSSH \uc870\ucc28 \ucde8\uc57d\uc810\uc744 \uac00\uc838\uc654\ub2e4. \uc774\ub294 \ubc84\uadf8\uac00 \uc5c6\ub294 \uc18c\ud504\ud2b8\uc6e8\uc5b4\ub97c \uc791\uc131\ud558\ub294 \uac83\uc774 \uc815\ub9d0\ub85c \ud798\ub4e4\uba70 \ucd5c\uace0\uc758 \ubcf4\uc548 \uac1c\ubc1c\uc790\ub4e4\ub3c4 \uc2e4\uc218\ud55c\ub2e4\ub294 \uc0ac\uc2e4\uc744 \ub9d0\ud574\uc900\ub2e4.<\/p>\n

 ** \uc81c\ub85c\ub370\uc774 \uacf5\uaca9 \ubc1c\uacac<\/p>\n

 \uc81c\ub85c \ub370\uc774 \uacf5\uaca9(zero-day attack)\uc740 \uc18c\ud504\ud2b8\uc6e8\uc5b4\uc5d0\uc11c \ub204\uad70\uac00\uac00 \uc774\uc804\uc5d0 \ubc1c\uacac\ub418\uc9c0 \uc54a\uc740 \ubcf4\uc548 \ucde8\uc57d\uc810\uc744 \ubc1c\uacac\ud55c \ud6c4 \uc774\uc5d0 \ub300\ud55c \uacf5\uaca9\uc744 \uc791\uc131\ud560 \ub54c \ubc1c\uc0dd\ud55c\ub2e4. \uc5bc\ub9c8 \ub3d9\uc548\uc740 \uc774 \uc0ac\ub78c\ub9cc \uc774 \ucde8\uc57d\uc810\uc744 \uc54c\uace0 \uc788\uac8c \ub418\ub294\ub370, \uc774\ub54c \uadf8\ub294 \uc120\ud0dd\uc758 \uae30\ub85c\uc5d0 \ub193\uc778\ub2e4. \uacf5\uaca9\uc744 \uc0ac\uc6a9\ud558\uc9c0 \uc54a\uace0 \ucde8\uc57d\uc810\uc744 \uc218\uc815\ud560 \uc218 \uc788\uac8c \uc18c\ud504\ud2b8\uc6e8\uc5b4 \ud68c\uc0ac\uc5d0\uac8c \uc54c\ub9ac\ub294 \uae38\uacfc \uac1c\uc778\uc801\uc778 \uc774\ub4dd\uc744 \uc704\ud574 \uacf5\uaca9\uc744 \uc0ac\uc6a9\ud558\uace0 \ub204\uad6c\uc5d0\uac8c\ub3c4 \uc54c\ub9ac\uc9c0 \uc54a\ub294 \uae38\uc774 \uc788\ub2e4. \ud6c4\uc790\ub294 \ubd84\uba85 \uc18c\ud504\ud2b8\uc6e8\uc5b4 \uc0ac\uc6a9\uc790\uc5d0\uac8c \uac00\uc7a5 \ud070 \uc704\ud611\uc774\uba70, \uc81c\ub85c \ub370\uc774 \uacf5\uaca9\uc740 \uc120\uc758\uc758 \ud574\ucee4\uc640 \uc545\uc758\uc758 \ud574\ucee4 \ubaa8\ub450\uc5d0 \uc758\ud574 \uc810\uc810 \ub354 \ub9ce\uc774 \ubc1c\uacac\ub418\uace0 \uc788\ub2e4.<\/p>\n

 ** \uc11c\uba85 \uae30\ubc18 \ud0d0\uc9c0\uc758 \uc601\ud5a5<\/p>\n

 \uc2a4\ub178\ud2b8 \uaddc\uce59\uc9d1\ud569\uc758 \uc77c\ubd80 \uc11c\uba85\uc740 \uacf5\uaca9\uc790\uac00 \ud2b9\uad8c\uc744 \uc5bb\uc740 \ud6c4 \uc2dc\uc2a4\ud15c\uc744 \uc218\uc0c1\ud55c \ubc29\uc2dd\uc73c\ub85c \uc0ac\uc6a9\ud558\ub824\ub294 \uc2dc\ub3c4\ub97c \uc77c\ubc18\uc801\uc73c\ub85c \ud0d0\uc9c0\ud558\uac8c \uc124\uacc4\ub410\ub2e4. \uc774\ub294 \ub54c\ub54c\ub85c \uc2a4\ub178\ud2b8\uac00 \uacf5\uaca9 \uc790\uccb4\ub97c \ud0d0\uc9c0\ud560 \ud544\uc694 \uc5c6\uc774 \uc81c\ub85c \ub370\uc774 \uacf5\uaca9\uc758 \uc601\ud5a5(\uc989, \uacf5\uaca9\uc790\uac00 \uad8c\ud55c\uc744 \uc5bb\uc740 \ud6c4 \uc2e4\uc81c\ub85c \uce68\ud22c\ub41c \uc2dc\uc2a4\ud15c\uc744 \uc0ac\uc6a9\ud558\ub824\uace0 \ud560 \ub54c)\uc744 \ud0d0\uc9c0\ud558\uac8c \ud574\uc900\ub2e4.<\/p>\n

 \uc81c\ub85c \ub370\uc774 \ucde8\uc57d\uc810 \ubb38\uc81c\ub85c \uc778\ud574 \ub124\ud2b8\uc6cc\ud06c \uc774\uc0c1 \ud0d0\uc9c0 \uc2dc\uc2a4\ud15c(Network Anomaly Detection System)\uc744 \uac1c\ubc1c\ud558\ub294 \uc0c8\ub85c\uc6b4 \ubd84\ub958\uc758 \ubcf4\uc548 \ud68c\uc0ac\uac00 \ub4f1\uc7a5\ud588\ub2e4. \ub124\ud2b8\uc6cc\ud06c \ud0d0\uc9c0 \uc2dc\uc2a4\ud15c\uc740 \ucef4\ud4e8\ud130 \ub124\ud2b8\uc6cc\ud06c \ub0b4\uc758 \uc774\uc0c1 \ud589\uc704\ub97c \ud0d0\uc9c0\ud558\uac8c \uc124\uacc4\ub41c \uc81c\ud488\uc774\ub2e4. \uc774\ub7f0 \uc2dc\uc2a4\ud15c\uc758 \ubaa9\ud45c\ub294 \uacf5\uaca9\uc790\uac00 \uce68\ud22c\uc5d0 \uc131\uacf5\ud55c \ud6c4 \ub124\ud2b8\uc6cc\ud06c \ub0b4\uc5d0\uc11c \uc2dc\uc2a4\ud15c\uc744 \uc0ac\uc6a9\ud558\ub294 \ubc29\uc2dd\uc744 \ud0d0\uc9c0\ud558\ub294 \uac83\uc774\ub2e4.<\/p>\n

 \ud558\uc9c0\ub9cc \ubb38\uc81c\ub294 \uc77c\uc0c1\uc801\uc778 \ub3d9\uc791\uacfc \ube44\uc77c\uc0c1\uc801\uc778 \ub3d9\uc791\uc744 \uad6c\ubcc4\ud558\uae30\uc5d0\ub294 \ub108\ubb34 \ud070 \uc774\uc885\uc131\uc774 \ub124\ud2b8\uc6cc\ud06c\uc5d0 \uc874\uc7ac\ud55c\ub2e4\ub294 \uac83\uc774\ub2e4. \uc0c1\uc6a9 \ud68c\uc0ac\uc640 \ud558\uacc4 \ubaa8\ub450\uc5d0\uc11c \uc54c\ub824\uc9c0\uc9c0 \uc54a\uc740 \ucde8\uc57d\uc810\uc5d0 \ub300\ud55c \uacf5\uaca9\uc758 \uc601\ud5a5\uc744 \uc5b4\ub5bb\uac8c \uc904\uc77c\uc9c0 \ud65c\ubc1c\ud788 \uc5f0\uad6c\ud558\uace0 \uc788\uc9c0\ub9cc \uc544\uc9c1 \uc77c\ubc18\uc801\uc778 \ud574\uacb0\ucc45\uc740 \uc5c6\ub2e4.<\/p>\n

 * \ud3ec\ud2b8 \ub178\ud0b9<\/span><\/p>\n

 2003\ub144 \ub9c8\ud2f4 \ud06c\ub9ac\uc9c0\ube48\uc2a4\ud0a4\ub294 \uc2dc\uc2a4\uc5b4\ub4dc\ubbfc(Sysadmin)\uc5d0 \uc2e4\uc740 \uae00\uc5d0\uc11c \ud3ec\ud2b8 \ub178\ud0b9(port knocking)\uc774\ub77c\ub294 \ud6cc\ub96d\ud55c \uac1c\ub150\uc744 \ubcf4\uc548 \ucee4\ubba4\ub2c8\ud2f0\uc5d0 \uc18c\uac1c\ud588\ub2e4. \ud3ec\ud2b8 \ub178\ud0b9\uc740 \uc11c\ube44\uc2a4(\uc608\ub97c \ub4e4\uc5b4 SSHD)\uac00 \uae30\ubcf8 \ubc84\ub9ac\uae30 \uc804\ub7b5\uc73c\ub85c \uc124\uc815\ub41c \ud328\ud0b7 \ud544\ud130\uc5d0 \uc758\ud574 \ubcf4\ud638\ub418\uac8c \ud574\uc8fc\ub294 \ub2eb\ud78c \ud3ec\ud2b8\ub97c \ud1b5\ud55c \uc778\uc99d \ub370\uc774\ud130\uc758 \ud1b5\uc2e0\uc774\ub2e4. \uae30\ubcf8 \ubc84\ub9ac\uae30 \ud328\ud0b7 \ud544\ud130\ub97c \ud1b5\ud574 \ubcf4\ud638\ub418\ub294 \uc11c\ube44\uc2a4\uc5d0 \uc5f0\uacb0\ud558\uace0\uc790 \ud558\ub294 \ud074\ub77c\uc774\uc5b8\ud2b8\ub294 \uc6b0\uc120 \uc720\ud6a8\ud55c \ud3ec\ud2b8 \ub178\ud06c \ub098\uc5f4(port knock sequence)\uc744 \uc18c\uc720\ud558\uace0 \uc788\ub2e4\ub294 \uac83\uc744 \uc99d\uba85\ud574\uc57c \ud55c\ub2e4. \ud074\ub77c\uc774\uc5b8\ud2b8\uac00 (\uc608\ub97c \ub4e4\uc5b4 \uc801\uc808\ud55c \uc21c\uc11c\ub85c \ud3ec\ud2b8 \ub098\uc5f4\uc744 \uad6c\uc131\ud558\ub294 \ud3ec\ud2b8\uc5d0 \uc5f0\uacb0\ud568\uc73c\ub85c\uc368) \uc62c\ubc14\ub978 \ub178\ud06c \ub098\uc5f4\uc744 \uc0dd\uc131\ud558\uba74 \ud328\ud0b7 \ud544\ud130\ub294 \ubcf4\ud638\ub418\ub294 \uc11c\ube44\uc2a4\uc5d0 \uc5f0\uacb0\ud558\uae30 \uc704\ud574 \ud3ec\ud2b8 \ub098\uc5f4\uc744 \uc804\uc1a1\ud55c IP \uc8fc\uc18c\ub97c \uc7a0\uc2dc \ud5c8\uc6a9\ud558\uac8c \uc77c\uc2dc\uc801\uc73c\ub85c \uc7ac\uc124\uc815 \ub41c\ub2e4.<\/p>\n

 \ud3ec\ud2b8 \ub178\ud0b9\uc740 \ube60\ub974\uac8c \uc804\ud30c\ub410\uc73c\uba70, \ubcf4\uc548 \ubd84\uc57c\uc5d0\uc11c \uc54c\ub824\uc9c4 \ud3ec\ud2b8 \ub178\ud0b9 \uad6c\ud604 \uae30\ubc95\ub9cc \uac70\uc758 30\uac1c\uc5d0 \uc774\ub978\ub2e4. \uac01 \uad6c\ud604\uc740 \ud3ec\ud2b8 \ub178\ud0b9\uc758 \uac1c\ub150\uc744 \uc57d\uac04\uc529 \ub2e4\ub974\uac8c \uc81c\uacf5\ud558\ub294\ub370, \uc608\ub97c \ub4e4\uc5b4 cd00r\uacfc \ud3ec\ud2b8 \ud0a4(port key)\ub294 \ud3ec\ud2b8 \ub178\ud06c \ub098\uc5f4\uc744 \uc804\uc1a1\ud558\uae30 \uc704\ud574 TCP SYN \ud328\ud0b7\uc744 \uc0ac\uc6a9\ud558\ub294 \ubc18\uba74 \ud140\ube14\ub7ec(Tumbler)\ub294 \ud574\uc2f1\ub41c \uc778\uc99d \ub370\uc774\ud130\ub97c \uc804\uc1a1\ud558\uae30 \uc704\ud574 \ud328\ud0b7 \ud398\uc774\ub85c\ub4dc\ub97c \uc0ac\uc6a9\ud55c\ub2e4.<\/p>\n

 ** Nmap\uacfc \ubaa9\ud45c \uc2dd\ubcc4 \ub2e8\uacc4 \ubb34\ub825\ud654\ud558\uae30<\/p>\n

 \ud3ec\ud2b8 \ub178\ud0b9 \ub098\uc5f4\uc740 \uc218\ub3d9\uc801\uc778 \ubc29\ubc95(\uc608\ub97c \ub4e4\uc5b4 \ubc29\ud654\ubcbd \ub85c\uadf8 \ud30c\uc77c\uc744 \uac10\uc2dc\ud558\uac70\ub098 libpcap \uacfc \uac19\uc740 \ud328\ud0b7 \ucea1\ucc98 \ub3c4\uad6c\ub97c \uc774\uc6a9\ud574\uc11c \uc778\ud130\ud398\uc774\uc2a4\ub97c \uc2a4\ub2c8\ud551\ud558\ub294 \ubc29\ubc95)\uc73c\ub85c \ub124\ud2b8\uc6cc\ud06c\ub97c \uac10\uc2dc\ud560 \uc218 \uc788\ub294 \ud3ec\ud2b8 \ub178\ud0b9 \uc11c\ubc84\uac00 \uac10\uc2dc\ud55c\ub2e4. \ud3ec\ud2b8 \ub178\ud0b9 \uc2dc\uc2a4\ud15c\uc744 \uc0ac\uc6a9\ud558\uba74 \uad81\uadf9\uc801\uc73c\ub85c \ub124\ud2b8\uc6cc\ud06c\ub97c \uc624\uac00\ub294 \ud2b8\ub798\ud53d\uc744 \uac10\uc2dc\ud560 \uc218 \uc5c6\ub294 \uc0ac\ub78c\uc5d0\uac8c\ub294 \uc11c\ube44\uc2a4\uac00 \ubcf4\uc774\uc9c0 \uc54a\uac8c \ub41c\ub2e4. Nmap \uc870\ucc28 \uae30\ubcf8 \ubc84\ub9ac\uae30 \ud328\ud0b7 \ud544\ud130\ub85c \ubcf4\ud638\ub418\ub294 \uc11c\ube44\uc2a4\ub294 \ubcfc \uc218 \uc5c6\ub2e4. \uacf5\uaca9\uc790\uac00 \uc81c\ub85c \ub370\uc774 \uacf5\uaca9\uc744 \uac00\uc9c0\uace0 \uc788\ub354\ub77c\ub3c4 \ub2ec\ub77c\uc9c0\ub294 \uac83\uc740 \uc5c6\ub2e4.<\/p>\n

 ** \uacf5\uc720 \ud3ec\ud2b8 \ub178\ud0b9 \ub098\uc5f4<\/p>\n

 \uacf5\uc720 \ud3ec\ud2b8 \ub178\ud0b9 \ub098\uc5f4\uc740 \ud3ec\ud2b8 \ub178\ud0b9 \ud074\ub77c\uc774\uc5b8\ud2b8\uc640 \uc11c\ubc84 \uac00\ub3d9\uc758 \ud55c \uc815\ub82c\ub41c \ud3ec\ud2b8 \uc9d1\ud569\uc774\ub2e4. \ub124\ud2b8\uc6cc\ud06c\uc5d0\uc11c \uc774 \ub098\uc5f4\uc774 \ubcf4\uc774\uba74 \uae30\ubcf8 \ubc84\ub9ac\uae30 \ud328\ud0b7 \ud544\ud130\ub294 \ub098\uc5f4\uc744 \uc804\uc1a1\ud55c \uac83\uc73c\ub85c \ubcf4\uc774\ub294 IP \uc8fc\uc18c\uac00 \ud2b9\uc815 \ud3ec\ud2b8\uc5d0 \uc811\uadfc\ud560 \uc218 \uc788\uac8c \uc7ac\uc124\uc815\ub41c\ub2e4. \uc608\ub97c \ub4e4\uc5b4 TCP \ud3ec\ud2b8 22\ubc88\uc5d0\uc11c \uc2e4\ud589 \uc911\uc778 SSHD\uc5d0 \uc811\uc18d\ud558\ub824\uba74 \ud074\ub77c\uc774\uc5b8\ud2b8\ub294 \uc6b0\uc120 SYN \ud328\ud0b7\uc744 TCP \ud3ec\ud2b8 5005, 5008, 1002, 1050 \uc73c\ub85c \uc804\uc1a1\ud574\uc57c \ud560 \uc218 \uc788\ub2e4. \uc774\ub7f0 \ub178\ud06c \ub098\uc5f4\uc774 \ub2eb\ud78c \ud3ec\ud2b8\ub85c\uc758 \ud328\ud0b7\uc744 \uae30\ub85d\ud558\uac8c \uc124\uc815\ub41c iptables \ubc29\ud654\ubcbd\uc5d0 \uc804\uc1a1\ub418\uba74 \ub85c\uadf8\uc5d0 \uc811\uc18d\uc744 \uc2dc\ub3c4\ud55c \ud3ec\ud2b8\uc758 \ub85c\uadf8\uac00 \ub098\ud0c0\ub0a0 \uac83\uc774\ub2e4.<\/p>\n

 \uc77c\ub2e8 \ud3ec\ud2b8 \ub178\ud0b9 \uc11c\ubc84\uac00 \/var\/log\/messages \ud30c\uc77c\uc5d0\uc11c \ud3ec\ud2b8 \ub178\ud06c \ub098\uc5f4\uc744 \ubc1c\uacac\ud558\uba74 iptables\ub294 SSHD\uc640 \uac19\uc740 \uc11c\ube44\uc2a4\ub85c\uc758 \uc811\uadfc\uc744 \uc77c\uc2dc\uc801\uc73c\ub85c \ud5c8\uc6a9\ud558\uac8c \uc7ac\uc124\uc815\ub41c\ub2e4.<\/p>\n

  \ud3ec\ud2b8 \ub178\ud0b9 \ub098\uc5f4\uc740 TCP \uc678\uc5d0 \ub2e4\ub978 \uc778\ud130\ub137 \ud504\ub85c\ud1a0\ucf5c\uc744 \uc218\ubc18\ud560 \uc218\ub3c4 \uc788\ub2e4. UDP, ICMP, \ub610\ub294 \uc138 \ud504\ub85c\ud1a0\ucf5c\uc774 \ub3d9\uc2dc\uc5d0 \ub098\uc5f4\uc744 \uad6c\uc131\ud560 \uc218\ub3c4 \uc788\ub2e4. \uc608\ub97c \ub4e4\uc5b4 \ud3ec\ud2b8 \ub178\ud06c \ub098\uc5f4\uc740 TCP\/10001, UDP\/2300, ICMP \uc5d0\ucf54 \uc694\uccad, TCP\/6005, UDP\/3000 \uacfc \uac19\uc744 \uc218 \uc788\ub2e4.<\/p>\n

 ICMP\uc5d0\ub294 “\ud3ec\ud2b8”\ub77c\ub294 \uac1c\ub150\uc774 \uc5c6\uae30 \ub54c\ubb38\uc5d0 \ud3ec\ud2b8 \ub178\ud0b9 \ub098\uc5f4\uc5d0 ICMP \ud328\ud0b7\uc744 \ud3ec\ud568\ud558\ub294 \uac83\uc740 \ud3ec\ud2b8 \ub178\ud0b9\uc758 \uc815\uc758\uc5d0\uc11c \uc57d\uac04 \ubc97\uc5b4\ub09c\ub2e4. \uadf8\ub7ec\ub098 \ud3ec\ud2b8 \ub178\ud0b9\uc740 \uc0ac\uc2e4 \uc815\ubcf4\ub97c \ud328\ud0b7 \ud5e4\ub354 \ub0b4\uc5d0 \uc778\ucf54\ub529\ud558\ub294 \uac83\uc5d0 \ub300\ud55c \uae30\uc220\uc774\ubbc0\ub85c ICMP \ud328\ud0b7\uc744 \ud3ec\ud568\ud558\ub294 \uac83\uc774 \ud3ec\ud2b8 \ub178\ud0b9\uc758 \uc815\uc758\ub97c \ud06c\uac8c \uc704\ubc29\ud558\ub294 \uac83\uc740 \uc544\ub2c8\ub2e4. ICMP\ub97c \ub098\uc5f4\uc5d0 \uc0ac\uc6a9\ud558\uc9c0 \ubabb\ud560 \uc774\uc720\ub294 \uc804\ud600 \uc5c6\ub2e4.<\/p><\/blockquote>\n

 \uc0ac\uc2e4 TCP\ub098 UDP \ud5e4\ub354\uc5d0\uc11c \ud3ec\ud2b8 \ud56d\ubaa9\uc744 \uc81c\uc678\ud55c \ub2e4\ub978 \ud56d\ubaa9\ub3c4 \ud3ec\ud2b8 \ub178\ud0b9 \ub098\uc5f4 \ub0b4\uc5d0 \ucd94\uac00\uc801\uc778 \uc815\ubcf4\ub97c \uc778\ucf54\ub529\ud558\ub294 \ub370 \uc0ac\uc6a9\ub420 \uc218 \uc788\ub2e4. \uc608\ub97c \ub4e4\uc5b4 UDP \ud5e4\ub354\uc758 16\ube44\ud2b8 \ud06c\uae30\uc758 \uccb4\ud06c\uc12c \ud56d\ubaa9\uc740 \ud3ec\ud2b8 \ub178\ud0b9 \ud074\ub77c\uc774\uc5b8\ud2b8\uc5d0 \uc758\ud574 \uc9c1\uc811 \ubbf8\ub9ac \uacb0\uc815\ub41c \uac12\uc73c\ub85c \uc124\uc815 \ub420 \uc218 \uc788\uc73c\uba70, \ud3ec\ud2b8 \ub178\ud0b9 \uc11c\ubc84\ub294 \uccb4\ud06c\uc12c\uc774 \ubbf8\ub9ac \uc815\ud55c \uac12\uacfc \ub9e4\uce6d\ub418\ub294 \uacbd\uc6b0 UDP \ud328\ud0b7\uc744 \ud3ec\ud2b8 \ub178\ud0b9 \ub098\uc5f4\uc758 \uc77c\ubd80\ub85c\uc11c \uc218\uc6a9\ud558\uac8c \uad6c\ud604\ub420 \uc218 \uc788\ub2e4.<\/p>\n

 ** \ud3ec\ud2b8 \ub178\ud0b9\uc758 \uad6c\uc870\uc801 \ud55c\uacc4<\/p>\n

 \ud3ec\ud2b8 \ub178\ud0b9\uc774 \ubc1c\uacac\ub418\uc9c0 \uc54a\uc740 \ubcf4\uc548 \ubc84\uadf8\ub97c \uac00\uc9c8 \uc218 \uc788\ub294 \ub124\ud2b8\uc6cc\ud06c \uc11c\ube44\uc2a4\uc5d0 \ub300\ud574 \ucd94\uac00\uc801\uc778 \ubcf4\ud638 \uacc4\uce35\uc744 \uc81c\uacf5\ud560 \uc218 \uc788\uc9c0\ub9cc \ud3ec\ud2b8 \ub178\ud0b9\uc740 \uadf8 \uad6c\uc870\uc801 \ud2b9\uc9d5\uc73c\ub85c \uc778\ud574 \ud68c\uc0ac \uc218\uc900\uc758 \ubc30\uce58\ub97c \ud558\uae30\uc5d0\ub294 \uc801\ud569\ud558\uc9c0 \uc54a\ub2e4. \uc774\ub7f0 \ud55c\uacc4\ub294 \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uacc4\uce35 \ud398\uc774\ub85c\ub4dc\ub97c \uc0ac\uc6a9\ud558\uc9c0\uc54a\uace0 \ud328\ud0b7 \ud5e4\ub354\ub97c \ub370\uc774\ud130 \uc804\uc1a1 \uae30\ubc95\uc73c\ub85c \uc0ac\uc6a9\ud558\ub294 \ub370\uc11c \uae30\uc778\ud55c\ub2e4.<\/p>\n

 – \ub098\uc5f4 \uc7ac\uc804\uc1a1 \ubb38\uc81c.
 \ubcf4\uc548 \uc704\ud611\uc774 \ub9e4\uc6b0 \ud070 \uc694\uc998\uc5d0\ub294 \ubaa8\ub4e0 \ud2b8\ub798\ud53d\uc774 \ub124\ud2b8\uc6cc\ud06c\ub97c \ud1b5\ud574 \uc804\uc1a1\ub420 \ub54c \ubbf8\uc9c0\uc758 \uc81c 3\uc790\uc5d0 \uc758\ud574 \uac10\uc2dc\ub2f9\ud55c\ub2e4\uace0 \uac00\uc815\ud574\uc57c \ud55c\ub2e4. \uc774\ub7f0 \uad00\uc810\uc5d0\uc11c \ubcfc \ub54c \ubbfc\uac10\ud55c \uc815\ubcf4(\uc608\ub97c \ub4e4\uc5b4 \uc2e0\uc6a9\uce74\ub4dc \ubc88\ud638)\ub294 \uc554\ud638\ud654\ub41c \ud615\ud0dc\ub85c \uc804\uc1a1\ub3fc\uc57c \ud55c\ub2e4.<\/p>\n

 \ud3ec\ud2b8 \ub178\ud0b9\uc758 \uacbd\uc6b0 \uc5b4\ub5a4 \ud328\ud0b7\ub3c4 \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uacc4\uce35 \ub370\uc774\ud130\ub97c \uac00\uc9c0\uc9c0 \uc54a\uc73c\ubbc0\ub85c \ud3ec\ud2b8 \ub178\ud0b9 \ub098\uc5f4\uc744 \uac00\ub85c\ucc4c \uc774\uc720\ub294 \uac70\uc758 \uc5c6\ub294 \uac83\ucc98\ub7fc \ubcf4\uc778\ub2e4.<\/p>\n

 \uadf8\ub7ec\ub098 \ud3ec\ud2b8 \ub178\ud0b9\uc758 \ubaa9\uc801\uc740 \uc218\uc2e0\uce21\uc774 \ud328\ud0b7 \ud544\ud130\ub97c \uc77c\uc2dc\uc801\uc73c\ub85c \uc7ac\uc124\uc815\ud574\uc11c \ub178\ud2b8 \ub098\uc5f4\uc744 \ud1b5\ud574 \uc790\uc2e0\uc744 \uc99d\uba85\ud55c IP \uc8fc\uc18c\uc5d0\uac8c \uc811\uadfc \uad8c\ud55c\uc744 \ubd80\uc5ec\ud558\uae30 \uc704\ud574 \ud544\uc694\ud55c \uc815\ubcf4\ub97c \ub124\ud2b8\uc6cc\ud06c\ub85c \uc804\uc1a1\ud558\ub294 \uac83\uc774\ub2e4. \ud3ec\ud2b8 \ub178\ud0b9 \ub098\uc5f4\uc774 \ub124\ud2b8\uc6cc\ud06c\ub97c \ud1b5\ud574 \uc804\uc1a1\ub420 \ub54c \uacf5\uaca9\uc790\uac00 \uc774\ub97c \uac00\ub85c\ucc4c \uc218 \uc788\ub2e4\uba74 \uacf5\uaca9\uc790\ub294 \ub098\uc911\uc5d0 \ub3d9\uc77c\ud55c \ubaa9\ud45c\uc5d0 \ub3d9\uc77c\ud55c \ub178\ud06c \ub098\uc5f4\uc744 \uc27d\uac8c \uc804\uc1a1\ud560 \uc218 \uc788\ub2e4. \uacf5\uaca9\uc790\uac00 \uc801\ubc95\ud55c \ud3ec\ud2b8 \ub178\ud0b9 \ud074\ub77c\uc774\uc5b8\ud2b8\uc640 \ub3d9\uc77c\ud55c \uc811\uadfc \uad8c\ud55c\uc744 \uc5bb\uae30 \uc704\ud574 \ubaa9\ud45c\uc5d0\uac8c \ub178\ud06c \ub098\uc5f4\uc744 \uc7ac\uc804\uc1a1\ud558\uae30 \ub54c\ubb38\uc5d0 \uc774\ub97c \uc7ac\uc804\uc1a1 \uacf5\uaca9(Reply attack)\uc774\ub77c\uace0 \ud55c\ub2e4. \ud3ec\ud2b8 \ub178\ud0b9\uc774 \ub2e8\uc21c\ud788 \ud328\ud0b7 \ud574\ub354\ub9cc\uc744 \uc0ac\uc6a9\ud558\uae30 \ub54c\ubb38\uc5d0 \ud3ec\ud2b8 \ub178\ud06c \ub098\uc5f4\uc5d0 \uc7ac\uc804\uc1a1 \uacf5\uaca9\uc744 \ub9c9\uc744 \uc815\ub3c4\ub85c \ucda9\ubd84\ud55c \uac00\ubcc0\uc131\uc744 \ucd94\uac00\ud558\uae30\ub294 \ud798\ub4e4\ub2e4.<\/p>\n

 \uc77c\ubd80 \ud3ec\ud2b8 \ub178\ud0b9 \uad6c\ud604\uc740 \uc7ac\uc804\uc1a1 \uacf5\uaca9\uc744 \ub9c9\uae30 \uc704\ud574 \ud574\uc26c \ud568\uc218\uc758 \uc5f0\uc18d\uc801\uc778 \ubc18\ubcf5(RFC 1760 \uc5d0\uc11c \uc815\uc758\ud558\ub294 S\/Key \uc778\uc99d\uacfc \uc720\uc0ac\ud568)\uc744 \uc0ac\uc6a9\ud558\uc9c0\ub9cc \uc774 \ubc29\ubc95\uc744 \uc0ac\uc6a9\ud558\ub824\uba74 \ud074\ub77c\uc774\uc5b8\ud2b8\uc640 \uc11c\ubc84\uac00 \ubaa8\ub450 \uc77c\uc885\uc758 \uc0c1\ud0dc \uc815\ubcf4\ub97c \uc800\uc7a5\ud574\uc57c \ud55c\ub2e4. \ub610\ub294 \ub2e8\uc21c\ud558\uac8c \uc77c\ub2e8 \uc811\uadfc \uad8c\ud55c\uc774 \ubd80\uc5ec\ub418\uba74 \uacf5\uc720 \ud3ec\ud2b8 \ub178\ud06c \ub098\uc5f4\uc774\ub098 \ud3c9\ubb38\ud654 \uc554\ud638\ub97c \ubcc0\uacbd\ud560 \uc218\ub3c4 \uc788\uc9c0\ub9cc \uc774\ub294 \ub9ce\uc740 \uc0ac\uc6a9\uc790\uac00 \uc774\uc6a9\ud558\ub294 \uc11c\ube44\uc2a4\uc5d0\ub294 \uc4f0\uc77c \uc218 \uc5c6\ub2e4.<\/p>\n

 – \ucd5c\uc18c \ub370\uc774\ud130 \uc804\uc1a1 \uc18d\ub3c4<\/p>\n

 TCP\uc640 UDP \ud5e4\ub354\uc758 \ud3ec\ud2b8 \ud56d\ubaa9\uc740 16\ube44\ud2b8\uae30 \ub54c\ubb38\uc5d0 \ud3ec\ud2b8 \ub178\ud0b9 \uad6c\ud604\uc774 \ub178\ud06c \ub098\uc5f4\uc758 \uac01 \ud328\ud0b7\uc5d0\uc11c \ubaa9\uc801\uc9c0 \ud3ec\ud2b8 \ubc88\ud638\ub9cc \uc0ac\uc6a9\ud55c\ub2e4\uace0 \uac00\uc815\ud558\uba74 \ud328\ud0b7\ub2f9 2 \ubc14\uc774\ud2b8\uc758 \uc815\ubcf4\ub9cc\uc744 \uc804\uc1a1\ud560 \uc218 \uc788\ub2e4. \ub610 \ud3ec\ud2b8 \ub178\ud0b9\uc5d0\ub294 TCP\uc640 \uac19\uc774 \ud328\ud0b7\uc744 \uc21c\uc11c\ub300\ub85c \uc804\ub2ec\ud558\uac70\ub098 \ud328\ud0b7\uc744 \uc7ac\uc804\uc1a1\ud558\ub294 \uae30\ubc95\uc774 \uc5c6\uae30 \ub54c\ubb38\uc5d0(\ud3ec\ud2b8 \ub178\ud0b9\uc740 \ucca0\uc800\ud788 \ub2e8\ubc29\ud5a5\uc774\ub2e4) \uc5f0\uc18d\uc801\uc778 \ud328\ud0b7 \uc0ac\uc774\uc5d0 \uc2dc\uac04 \uc9c0\uc5f0\uc744 \ucd94\uac00\ud558\uc9c0 \uc54a\uace0\ub294 \uc804\uccb4 \ud3ec\ud2b8 \ub178\ud0b9 \ub098\uc5f4\uc744 \ub124\ud2b8\uc6cc\ud06c\ub85c \uc804\uc1a1\ud560 \uc218 \uc5c6\ub2e4. \ud328\ud0b7\uc774 \uc5ec\ub7ec \ub77c\uc6b0\ud305 \uacbd\ub85c\ub85c \ub3c4\ucc29\ud560 \uc218 \uc788\uae30 \ub54c\ubb38\uc5d0(\uc989, \uc5b4\ub5a4 \ud328\ud0b7\uc740 \ub2e4\ub978 \ud328\ud0b7\ubcf4\ub2e4 \ub290\ub9b4 \uc218\ub3c4 \uc788\ub2e4) \uc62c\ubc14\ub978 \ud3ec\ud2b8 \ub178\ud0b9 \ub098\uc5f4\uc758 \uc815\ub82c\uc744 \uc720\uc9c0\ud558\uae30 \uc704\ud574\uc11c\ub294 \uc2dc\uac04 \uc9c0\uc5f0\uc774 \ud544\uc694\ud558\ub2e4.<\/p>\n

 \ubaa8\ub4e0 \ub124\ud2b8\uc6cc\ud06c\uc5d0 \uc798 \uc801\uc6a9\ub418\ub294 \ucd5c\uc801\uc758 \uc2dc\uac04 \uc9c0\uc5f0\uc740 \uc5c6\uc9c0\ub9cc(\uadf8\ub9ac\uace0 \uc2e4\uc81c\ub85c \ud3ec\ud2b8 \ub178\ud0b9 \ub098\uc5f4\uc758 \uc77c\ubd80\uac00 \uc190\uc2e4\ub418\uba74 \uc804\uccb4 \ub098\uc5f4\uc744 \uc7ac\uc804\uc1a1\ud574\uc57c \ud558\uc9c0\ub9cc) 0.5 \ucd08 \uc815\ub3c4\uc758 \uc2dc\uac04 \uc9c0\uc5f0\uc774 \ud544\uc694\ud558\ub2e4.<\/p>\n

 \uadf8\ub7ec\ubbc0\ub85c 128\ube44\ud2b8 \ube14\ub85d \ud06c\uae30(Rijndael \uc54c\uace0\ub9ac\uc998\uc758 \ucd5c\uc18c \ube14\ub85d \ud06c\uae30)\ub97c \uac00\uc9c0\ub294 \ub300\uce6d \ud0a4 \uc54c\uace0\ub9ac\uc998\uc73c\ub85c \uc554\ud638\ud654\ub41c \ud3ec\ud2b8 \ub178\ud0b9 \ub098\uc5f4\uc758 \uacbd\uc6b0 \ucd5c\uc18c\ud55c 8\uac1c\uc758 \ud328\ud0b7\uc774 \ud544\uc694\ud558\ub2e4(128 \ube44\ud2b8 \/ \ud328\ud0b7\ub2f9 16 \ube44\ud2b8 = 8\ud328\ud0b7). \ud328\ud0b7 \uc0ac\uc774\ub9c8\ub2e4 0.5 \ucd08\uc758 \uc9c0\uc5f0\uc744 \ucd94\uac00\ud558\ub294 \uac83\uc740 \ub098\uc5f4\uc740 \uc804\uc1a1\ud558\ub294 \ub370\ub9cc 4\ucd08\uac00 \ud544\uc694\ud558\uba70 \ub370\uc774\ud130\ub97c \ub354 \uc804\uc1a1\ud574\uc57c \ud558\ub294 \uacbd\uc6b0\ub124\ub294 \ub450 \ud328\ud0b7\ub9c8\ub2e4 1\ucd08\uc529 \ucd94\uac00\ub41c\ub2e4\ub294 \uc758\ubbf8\uc774\ub2e4. \uc218 \ubc14\uc774\ud2b8 \uc774\uc0c1\uc758 \ub370\uc774\ud130\ub97c \uc804\uc1a1\ud558\ub294 \ud3ec\ud2b8 \ub178\ud0b9 \ub098\uc5f4\uc744 \uad6c\uc131\ud558\ub294 \uac83\uc744 \ud604\uc2e4\uc801\uc73c\ub85c \ubd88\uac00\ub2a5\ud558\uac8c \ud558\ub294 \uac83\uc774 \ubc14\ub85c \uae34 \uc804\uc1a1 \uc2dc\uac04\uc774\ub2e4.<\/p>\n

 \ud3ec\ud2b8 \ub178\ud0b9\uc758 \ub370\uc774\ud130 \uc804\uc1a1 \uae30\ub2a5\uc774 \uadf9\ud788 \uc81c\ud55c\uc801\uc774\uae30 \ub54c\ubb38\uc5d0 \ud3ec\ud2b8 \ub178\ud0b9 \ub098\uc5f4\uc744 \uc554\ud638\ud654\ud558\uae30 \uc704\ud574 \ube44\ub300\uce6d \uc554\ud638\ud654 \uc54c\uace0\ub9ac\uc998\uc744 \uc0ac\uc6a9\ud558\ub294 \uac83\uc740 \uc801\uc808\ud558\uc9c0 \uc54a\ub2e4. GnuPG\uc640 2048 \ube44\ud2b8 \ud0a4\ub97c \uc0ac\uc6a9\ud558\ub294 Elgamal\ub85c 10 \ubc14\uc774\ud2b8\uc758 \uc815\ubcf4\ub9cc\uc744 \uc554\ud638\ud654\ud574\ub3c4 \uc218\ubc31 \ubc14\uc774\ud2b8\uc758 \uc554\ud638\ud654\ub41c \uc815\ubcf4\uac00 \uc0dd\uc131\ub41c\ub2e4.<\/p><\/blockquote>\n

 – \ub178\ud06c \ub098\uc5f4\uacfc \ud3ec\ud2b8 \uc2a4\uce94<\/p>\n

 \ud3ec\ud2b8 \uc2a4\uce94\uc740 \uc9e7\uc740 \uc2dc\uac04 \ub3d9\uc548 \ub2e4\uc218\uc758 \ubaa9\ud45c \uc2dc\uc2a4\ud15c \ud3ec\ud2b8\uc5d0 \uc5f0\uacb0\ud55c\ub2e4. \ud3ec\ud2b8 \uc2a4\uce94\uacfc \ub178\ud06c \ub098\uc5f4\uc758 \ubaa9\uc801\uc740 \uc804\ud600 \ub2e4\ub984\uc5d0\ub3c4 \ubd88\uad6c\ud558\uace0 \ub124\ud2b8\uc6cc\ud06c\uc0c1\uc5d0\uc11c \ubcf4\uba74 \ud3ec\ud2b8 \ub178\ud06c \ub098\uc5f4\ub3c4 \ud3ec\ud2b8 \uc2a4\uce94\uc758 \uc815\uc758\uc5d0 \uc815\ud655\ud788 \uc77c\uce58\ud55c\ub2e4. \ubb38\uc81c\ub294 \ud3ec\ud2b8 \uc2a4\uce94\uc744 \ud0d0\uc9c0\ud558\ub294 \uce68\uc785 \ud0d0\uc9c0 \uc2dc\uc2a4\ud15c\uc774 \ub450 \ud65c\ub3d9\uc744 \uad6c\ubcc4\ud558\uc9c0 \ubabb\ud574\uc11c \ub458 \ubaa8\ub450\uc5d0 \ub300\ud574 \uacbd\uace0\ub97c \uc0dd\uc131\ud55c\ub2e4\ub294 \uc810\uc774\ub2e4. \uc774\ub7f0 \uacbd\uace0 \ub54c\ubb38\uc5d0 \uc6d0\uaca9 \uc11c\ube44\uc2a4\uc5d0 \uc778\uc99d\ud558\uae30 \uc704\ud574 \ud3ec\ud2b8 \ub178\ud0b9\uc744 \uc0ac\uc6a9\ud558\ub294 \uc0ac\ub78c\uc5d0\uac8c \ubd88\ud544\uc694\ud55c \uc8fc\uc758\ub97c \uae30\uc6b8\uc5ec\uc57c \ud560 \uc218 \uc788\ub2e4.<\/p>\n

 – \uc2a4\ud478\ud551\ub41c \ud328\ud0b7\uc744 \uc774\uc6a9\ud55c \ub178\ud06c \ub098\uc5f4 \ud30c\uad34<\/p>\n

 \ud3ec\ud2b8 \ub178\ud0b9\uc740 (\uc554\ud638\ud654\ub41c \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uacc4\uce35 \ub370\uc774\ud130\ub97c \uc0ac\uc6a9\ud558\uc9c0 \uc54a\uace0) \ud328\ud0b7 \ud5e4\ub354\uc758 \uc815\ubcf4\ub9cc\uc744 \uc778\ucf54\ub529\ud558\uae30 \ub54c\ubb38\uc5d0 \uacf5\uaca9\uc790\ub294 \ud328\ud0b7\uc774 \uc801\ubc95\ud55c \ub178\ud06c \ub098\uc5f4\uc758 \uc77c\ubd80\uc778 \uac83\ucc98\ub7fc \uc27d\uac8c \uafb8\ubc00 \uc218 \uc788\ub2e4. \ud328\ud0b7\uc774 \ub124\ud2b8\uc6cc\ud06c\uc5d0 \uc788\ub294 \ub3c4\uc911\uc5d0 \uc911\ubcf5 \ud328\ud0b7\uc744 \ud3ec\ud2b8 \ub178\ud0b9 \ub098\uc5f4\ub85c \uc2a4\ud478\ud551\ud558\uba74 \ub178\ud06c \uc11c\ubc84\ub294 \uc774 \ucd94\uac00\uc801\uc778 \ud328\ud0b7\uc774 \ud3ec\ud2b8 \ub178\ud0b9 \ud074\ub77c\uc774\uc5b8\ud2b8\uac00 \uc804\uc1a1\ud55c \uc2e4\uc81c \ub098\uc5f4\uc758 \uc77c\ubd80\uac00 \uc544\ub2c8\ub77c\ub294 \uac83\uc744 \uc54c \uc218 \uc5c6\ub2e4. \uacb0\uacfc\uc801\uc73c\ub85c \uc11c\ubc84\ub294 \ud074\ub77c\uc774\uc5b8\ud2b8\uac00 \uc720\ud6a8\ud55c \ub178\ud06c \ub098\uc5f4\uc744 \uc54c\uc9c0 \ubabb\ud55c\ub2e4\uace0 \ud310\ub2e8\ud55c\ub2e4. \uacf5\uaca9\uc790\ub294 \uc11c\ubc84\uac00 \uc801\ubc95\ud55c \ud3ec\ud2b8 \ub178\ud0b9 \ud074\ub77c\uc774\uc5b8\ud2b8\uc5d0\uac8c \uad8c\ud55c\uc744 \ubd80\uc5ec\ud558\uc9c0 \ubabb\ud558\uac8c \ud560 \uc218 \uc788\uae30 \ub54c\ubb38\uc5d0 \uc774\ub294 \ub178\ud06c \uc11c\ubc84\uc5d0 \ub300\ud55c \uc11c\ube44\uc2a4 \uac70\ubd80(Dos) \uacf5\uaca9\uc774\ub2e4. DoS \uacf5\uaca9\uc774 \ubcf5\uc7a1\ud55c \uc791\uc5c5\uc77c \uc218\ub3c4 \uc788\uc9c0\ub9cc(\uc608\ub97c \ub4e4\uc5b4 \uc880\ube44 \uba38\uc2e0\uc73c\ub85c \uad6c\uc131\ub41c \ub124\ud2b8\uc6cc\ud06c\uc5d0\uc11c \ub2e8\uc77c IP \uc8fc\uc18c\ub85c\uc758 \ud2b8\ub798\ud53d \ud50c\ub7ec\ub529\uc744 \uad00\ub9ac\ud574\uc57c \ud55c\ub2e4) \ub54c\ub85c\ub294 \uc218\ud589\ud558\uae30 \ub9e4\uc6b0 \uac04\ub2e8\ud560 \uc218\ub3c4 \uc788\ub2e4. \uc608\ub97c \ub4e4\uc5b4 \uc11c\ubc84\uc5d0 \ub300\ud55c DoS\uc5d0\ub294 \ud558\ub098\uc758 \ud328\ud0b7\ub9cc\uc774 \ud544\uc694\ud558\uba70 \uc774\ub7f0 \uacf5\uaca9\uc740 \ub108\ubb34\ub3c4 \uc218\ud589\ud558\uae30 \uc26c\uc6b0\uba70 \uc5b4\ub290 \uacf3\uc73c\ub85c\ubd80\ud130\ub3c4 \uc2a4\ud478\ud551\ub420 \uc218 \uc788\ub2e4!<\/p>\n

 * \ub2e8\uc77c \ud328\ud0b7 \uad8c\ud55c \ubd80\uc5ec<\/span><\/p>\n

 \ub2e8\uc77c \ud328\ud0b7 \uad8c\ud55c \ubd80\uc5ec(SPA, Single Packet Authorization)\ub294 \ud3ec\ud2b8 \ub178\ud0b9 \uad6c\ud604\uacfc \uc720\uc0ac\ud55c \ubc29\uc2dd\uc73c\ub85c \uae30\ubcf8 \ubc84\ub9ac\uae30 \ud328\ud0b7 \ud544\ud130\uc640 \uc218\ub3d9\uc801\uc73c\ub85c \uac10\uc2dc\ud558\ub294 \ud328\ud0b7 \uc2a4\ub2c8\ud37c\ub97c \uacb0\ud569\ud55c\ub2e4. \uadf8\ub7ec\ub098 \ud328\ud0b7 \ud5e4\ub354 \ud56d\ubaa9\uc744 \uc774\uc6a9\ud574\uc11c \uc778\uc99d \ub370\uc774\ud130\ub97c \uc804\uc1a1\ud558\ub294 \ub300\uc2e0 SPA\ub294 \uc778\uc99d \uc815\ubcf4\uc758 \uc18c\uc720\ub97c \uc99d\uba85\ud558\uae30 \uc704\ud574 \ud398\uc774\ub85c\ub4dc \ub370\uc774\ud130\ub97c \ud65c\uc6a9\ud55c\ub2e4. \uc774\ub294 \ub300\ubd80\ubd84 \ub124\ud2b8\uc6cc\ud06c\uc758 MTU \ud06c\uae30\uac00 \uc218\ubc31 \ubc14\uc774\ud2b8 \ub2e8\uc704(\uc608\ub97c \ub4e4\uc5b4 \uc774\ub354\ub137 MTU \ub294 \uc774\ub354\ub137 \ud5e4\ub354\ub97c \ud3ec\ud568\ud574\uc11c 1514 \ubc14\uc774\ud2b8\ub2e4)\uae30 \ub54c\ubb38\uc5d0 \uac00\ub2a5\ud558\uba70 \ud074\ub77c\uc774\uc5b8\ud2b8\ub294 \ub2e8 \ud558\ub098\uc758 \ud328\ud0b7\uc73c\ub85c SPA \uc11c\ubc84\uc5d0 \uc790\uc2e0\uc758 \uc2dd\ubcc4 \uc815\ubcf4\ub97c \uc804\uc1a1\ud560 \uc218 \uc788\ub2e4.<\/p>\n

 ** \ud3ec\ud2b8 \ub178\ud0b9 \ud55c\uacc4\uc810 \ud574\uacb0.<\/p>\n

 \ud3ec\ud2b8 \ub178\ud0b9 \ud504\ub85c\ud1a0\ucf5c\uc774 \uac00\uc9c0\ub294 \ubb38\uc81c\ub97c \uc694\uc57d\ud558\uba74 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\n

 – \ud3ec\ud2b8 \ub178\ud0b9 \ub098\uc5f4\uc744 \uac10\uc2dc\ud560 \uc218 \uc788\ub294 \uacf5\uaca9\uc790\uc758 \uc7ac\uc804\uc1a1 \uacf5\uaca9\uc744 \ub9c9\uae30 \ud798\ub4e4\ub2e4.
 – \ud6a8\uacfc\uc801\uc778 \ub370\uc774\ud130 \uc804\uc1a1 \ubc29\ubc95\uc758 \ubd80\uc7ac\ub85c \uc778\ud574 \uc804\uc1a1\ud560 \uc218 \uc788\ub294 \uc815\ubcf4 \uc720\ud615\uacfc \ub098\uc5f4 \ub370\uc774\ud130\ub97c \uc554\ud638\ud654\ud558\ub294 \ub370 \uc0ac\uc6a9\ud560 \uc218 \uc788\ub294 \uc554\ud638\ud654 \uc54c\uace0\ub9ac\uc998\uc774 \uc81c\ud55c\ub41c\ub2e4.
 – \ud3ec\ud2b8 \ub178\ud06c \ub098\uc5f4\uc774 \ub124\ud2b8\uc6cc\ud06c\ub97c \ud1b5\ud574 \uc804\uc1a1\ub420 \ub54c \uc911\uac04 IDS\uac00 \uacbd\uace0\ub97c \uc0dd\uc131\ud560 \uc218 \uc788\ub2e4.
 – \ud574\ud0b7 \ud5e4\ub354\uc758 \uc911\ubcf5\uacfc \uc2a4\ud478\ud551\uc740 \uc5b4\ub835\uc9c0 \uc54a\uae30 \ub54c\ubb38\uc5d0 \ub098\uc5f4 \ud30c\uad34 \uacf5\uaca9\uc774 \ub9e4\uc6b0 \uc27d\ub2e4.<\/p>\n

 SPA \uc5d0\uc11c\ub294 \ud398\uc774\ub85c\ub4dc \ub370\uc774\ud130\ub97c \uc0ac\uc6a9\ud574\uc11c \uc774\ub7f0 \ubb38\uc81c\ub97c \ud574\uacb0\ud55c\ub2e4.<\/p>\n

 – SPA\ub294 \ubaa8\ub4e0 SPA \ud328\ud0b7\uc5d0 \ubb34\uc791\uc704 \ub370\uc774\ud130\ub97c \ud3ec\ud568\uc2dc\ud0a4\ub294 \ubc29\ubc95\uc73c\ub85c \uc7ac\uc804\uc1a1 \ubb38\uc81c\ub97c \ud574\uacb0\ud55c\ub2e4. SPA \ud328\ud0b7\uc740 \uc798 \uc815\uc758\ub41c \ud3c9\ubb38 \ud328\ud0b7 \ud615\uc2dd\uc5d0 \ub530\ub77c \uad6c\uc131\ub41c\ub2e4. \uc774 \ud615\uc2dd\uc5d0\ub294 \ubb34\uc791\uc704 \ub370\uc774\ud130\ub97c \uc704\ud55c \ubd80\ubd84\uc774 \uc788\uc73c\uba70, \ud328\ud0b7\uc740 \uad6c\uc131\ub41c \ud6c4 \uc554\ud638\ud654\ub41c\ub2e4. \ubb34\uc791\uc704 \ub370\uc774\ud130\ub97c \ud3ec\ud568\ud558\ub294 \uac83\uc740 \uc5b4\ub5a4 SPA \ud328\ud0b7\ub3c4(SPA \uc11c\ubc84\uc5d0 \ub3d9\uc77c\ud55c \uc811\uadfc\uc744 \uc694\uccad\ud558\ub294 \ud328\ud0b7\ub07c\ub9ac\ub3c4) \uacb9\uce58\uc9c0 \uc54a\uac8c \ubcf4\uc7a5\ud574\uc900\ub2e4. \uc5b4\ub5a4 SPA \ud328\ud0b7\ub3c4 \ub3d9\uc77c\ud55c MD5 \uc758 \ud569\uc744 \uac00\uc9c0\uc9c0 \uc54a\ub294\ub2e4\ub294 \uac83\uc744 \uc54c\uae30 \ub54c\ubb38\uc5d0 \uc131\uacf5\uc801\uc73c\ub85c \ud3b8\ubb38\ud654\ub41c SPA \ud328\ud0b7\uc758 MD5 \ud569\uc744 \uc11c\ubc84 \uce21\uc5d0 \uc800\uc7a5\uc554\uc73c\ub85c\uc368 \ub3d9\uc77c\ud55c \uc811\uadfc \uc694\uccad\uc740 \ubc18\ubcf5\uc801\uc73c\ub85c \uc804\uc1a1\ud560 \uc218 \uc5c6\ub2e4. \uadf8\ub7ec\ubbc0\ub85c \uc0c8\ub85c\uc6b4 SPA \ud328\ud0b7\uacfc \uc774\uc804\uc5d0 \uac10\uc2dc\ub41c \ud328\ud0b7\uc758 MD5 \ud569\uc744 \ube44\uad50\ud568\uc73c\ub85c\uc368 \uc7ac\uc804\uc1a1 \uacf5\uaca9\uc744 \uc27d\uac8c \ubb34\ub825\ud654\uc2dc\ud0ac \uc218 \uc788\ub2e4.<\/p>\n

 – SPA\ub294 TCP\uac00 \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \ub370\uc774\ud130\ub97c \ucea1\uc290\ud654\ud558\ub294 \uac83\uacfc \uc720\uc0ac\ud55c \ubc29\uc2dd\uc73c\ub85c IP \ud328\ud0b7\uc758 \ud398\uc774\ub85c\ub4dc \ubd80\ubd84\uc744 \uc0ac\uc6a9\ud574\uc11c \ub370\uc774\ud130 \uc804\uc1a1 \ubb38\uc81c\ub97c \ud574\uacb0\ud55c\ub2e4. \ud328\ud0b7 \ud398\uc774\ub85c\ub4dc\ub97c \uc0ac\uc6a9\ud558\uba74 \ube44\ub300\uce6d \uc54c\uace0\ub9ac\uc998\uc744 \uc0ac\uc6a9\ud558\uae30 \uc26c\uc6cc\uc9c0\ub294\ub370, \uc774\ub294 \ud328\ud0b7 \ud398\uc774\ub85c\ub4dc\uac00 (\ud328\ud0b7 \ud5e4\ub354\ub9cc\uc744 \uc0ac\uc6a9\ud558\ub294) \uadf8 \uc5b4\ub5a4 \ud3ec\ud2b8 \ub178\ud0b9 \uad6c\ud604\ubcf4\ub2e4\ub3c4 \ub9ce\uc740 \uc591\uc758 \ub370\uc774\ud130\ub97c \uc804\uc1a1\ud560 \uc218 \uc788\uae30 \ub54c\ubb38\uc774\ub2e4. SPA\ub97c \ud1b5\ud55c \uba85\ub839 \ucc44\ub110(\uc989, \uc554\ud638\ud654\ub41c SPA \ud398\uc774\ub85c\ub4dc\uc5d0 \uc644\uc804\ud55c \uba85\ub839\uc744 \ub2f4\uc544 \uc804\uc1a1\ud558\ub294 \uac83)\ub3c4 \uc0dd\uc131\ud560 \uc218 \uc788\ub2e4.<\/p>\n

 – SPA\ub294 \uc778\uc99d \uc815\ubcf4\ub97c \uc804\uc1a1\ud558\uae30 \uc704\ud574 \ub2e8 \ud558\ub098\uc758 \ud328\ud0b7\ub9cc\uc744 \uc0ac\uc6a9\ud558\uae30 \ub54c\ubb38\uc5d0 SPA \ub124\ud2b8\uc6cc\ud06c \ud1b5\uc2e0\uc740 \uc808\ub300 \ud3ec\ud2b8 \uc2a4\uce94\ucc98\ub7fc \ubcf4\uc774\uc9c0 \uc54a\ub294\ub2e4. \uadf8\ub7ec\ubbc0\ub85c IDS\ub294 \ud3ec\ud2b8 \ubc94\uc704\uc5d0 \ub300\ud55c \ud0d0\uc0ac\ub4e4\uc744 \ubcf4\uc9c0 \uc54a\uac8c \ub41c\ub2e4. SPA \ud398\uc774\ub85c\ub4dc\ub294 \uc554\ud638\ud654\ub418\uae30 \ub54c\ubb38\uc5d0 IDS\ub294 SPA \uba54\uc2dc\uc9c0\uc758 \ub0b4\uc6a9\ub3c4 \ub514\ucf54\ub529\ud560 \uc218 \uc5c6\ub2e4. SPA \ud328\ud0b7\uc740 \uc2a4\ub2c8\ud551\ud558\ub294 \uce21\uc5d0\uac8c \ud574\uc124 \ubd88\uac00\ub2a5\ud55c \ud398\uc774\ub85c\ub4dc \ub370\uc774\ud130 \ub369\uc5b4\ub9ac\ub85c \ubcf4\uc778\ub2e4.<\/p>\n

 – SPA\ub97c \uc0ac\uc6a9\ud558\uba74 \uacf5\uaca9\uc790\ub294 SPA \ud074\ub77c\uc774\uc5b8\ud2b8 \uc2dc\uc2a4\ud15c\uc73c\ub85c\ubd80\ud130 SPA \uc11c\ubc84\ub85c \ud328\ud0b7\uc744 \uc2a4\ud478\ud551\ud558\ub294 \ubc29\ubc95\uc73c\ub85c SPA \ud504\ub85c\ud1a0\ucf5c\uc744 \uc27d\uac8c \uae70 \uc218 \uc5c6\uae30 \ub54c\ubb38\uc5d0 \uc2a4\ud478\ud551 \uacf5\uaca9\uc744 \ubb34\ub825\ud654\ud560 \uc218 \uc788\ub2e4(\ubb3c\ub860 \ub124\ud2b8\uc6cc\ud06c \ud328\ud0b7 \ub370\uc774\ud130\ub97c \uc870\uc0ac\ud558\ub294 \ubaa8\ub4e0 \uc2dc\uc2a4\ud15c\uc740 \uc4f0\ub808\uae30 \ud328\ud0b7 \ub370\uc774\ud130\ub85c \ud50c\ub7ec\ub529 \ub2f9\ud560 \uacbd\uc6b0 DoS \uc5d0 \ucde8\uc57d\ud558\uae30 \uc27d\uc9c0\ub9cc \uc774\ub294 SPA \ud504\ub85c\ud1a0\ucf5c \uc790\uccb4\uc758 \uc57d\uc810\uc740 \uc544\ub2c8\ub2e4).<\/p>\n

 ** SPA\uc758 \uad6c\uc870\uc801 \ud55c\uacc4<\/p>\n

 – NAT \uc8fc\uc18c\ub97c \ud1b5\ud55c \ud53c\uae30 \ubc31\ud0b9(Piggy-Backing) \uc811\uadfc
  \ud328\ud0b7 \ud544\ud130\ub294  \uc77c\ubc18\uc801\uc73c\ub85c \uc804\uc1a1 \uacc4\uce35\uc774\ub098 \uadf8 \uc774\ud558 \uacc4\uce35\uc5d0\uc11c \ud2b8\ub798\ud53d\uc744 \ud544\ud130\ub9c1\ud558\ub294 \ub370\ub294 \uc6b0\uc218\ud558\uc9c0\ub9cc \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uacc4\uce35\uc744 \ud574\uc124\ud558\ub294 \ub370\ub294 \uadf8\ub2e4\uc9c0 \uc88b\uc9c0 \ubabb\ud558\ub2e4. \uacb0\uacfc\uc801\uc73c\ub85c SPA\uac00 (\uc720\ud6a8\ud55c SPA \ud328\ud0b7\uc744 \uc218\uc2e0\ud55c \ud6c4) \ub4e4\uc5b4\uc624\ub294 \uc5f0\uacb0\uc744 \uc218\uc6a9\ud558\uae30 \uc704\ud574 \uc801\uc6a9\ud558\ub294 \ud544\ud130\ub9c1 \uae30\uc900\uc740 \ud604\uc2e4\uc801\uc73c\ub85c \ucd9c\ubc1c\uc9c0 IP \uc8fc\uc18c, \uc694\uccad\ub41c \uc778\ud130\ub137 \ud504\ub85c\ud1a0\ucf5c, \ud3ec\ud2b8 \ubc88\ud638\ub9cc \ud3ec\ud568\ud560 \uc218 \uc788\ub2e4. \uc989, SPA \ud328\ud0b7\uc774 SPA \uc11c\ubc84\uc5d0\uac8c TCP \ud3ec\ud2b8 22\ub97c 30\ucd08 \ub3d9\uc548 \ud2b9\uc815 IP \uc8fc\uc18c\uc5d0 \ub300\ud574 \uc5f4\uac8c” \uc9c0\uc2dc\ud560 \ub54c SPA \uc11c\ubc84\ub294 30\ucd08 \ub3d9\uc548 \ucd9c\ubc1c\uc9c0 IP \uc8fc\uc18c\uc5d0\uc11c TCP \ud3ec\ud2b8 22\ub85c \uc5f0\uacb0\ud558\ub294 \ubaa8\ub4e0 \ud328\ud0b7\uc744 \uc218\uc6a9\ud558\uac8c \ud328\ud0b7 \ud544\ud130\ub97c \uc124\uc815\ud55c\ub2e4. SPA \ud328\ud0b7 \ub0b4\uc758 IP \uc8fc\uc18c\uac00 \uc678\ubd80 NAT \uc8fc\uc18c\ub77c\uba74(\uc774\ub294 SPA \ud074\ub77c\uc774\uc5b8\ud2b8\uac00 NAT \uc7a5\uce58 \ub4a4\uc5d0 \uc788\uc744 \ub54c \ud544\uc694\ud558\ub2e4)\uc801\ubc95\ud55c \ud074\ub77c\uc774\uc5b8\ud2b8\uc640 \ub3d9\uc77c\ud55c \ub0b4\ubd80 \ub124\ud2b8\uc6cc\ud06c\uc0c1\uc758 \ub204\uad6c\ub77c\ub3c4 \ud5c8\uc6a9\ub41c \uc2dc\uac04 \ub3d9\uc548 \ub3d9\uc77c\ud55c \uc811\uadfc \uad8c\ud55c\uc744 \uac00\uc9c0\uac8c \ub41c\ub2e4.<\/p>\n

 – HTTP\uc640 \ub2e8\uae30 \uc138\uc158
 SPA \ub370\ubaac\uc774 TCP \uc5f0\uacb0\uc758 \uc218\ub9bd\uc744 \ud5c8\uc6a9\ud558\uae30 \uc704\ud574 \ud328\ud0b7 \ud544\ud130 \uaddc\uce59\uc9d1\ud569\uc5d0 \uc784\uc2dc \uaddc\uce59\uc744 \ucd94\uac00\ud560 \ub54c \uc801\ubc95\ud55c \ud074\ub77c\uc774\uc5b8\ud2b8 \uce21\uc5d0\ub294 \ubcf4\ud1b5 TCP \uc4f0\ub9ac\uc6e8\uc774 \ud578\ub4dc\uc250\uc774\ud06c\ub97c \uc644\ub8cc\ud558\uae30\uc5d0 \ucda9\ubd84\ud55c \uc2dc\uac04\uc774 \uc788\ub2e4. \uadf8\ub7ec\ub098 SSH \uc138\uc158\uc740 \ubcf4\ud1b5 TCP \uc5f0\uacb0\uc744 \uc218\ub9bd\ub41c \uc0c1\ud0dc\ub85c \ub9cc\ub4dc\ub294\ub370 \ud544\uc694\ud55c \uc2dc\uac04\ubcf4\ub2e4 \ud6e8\uc52c \ub354 \uae38\uac8c \uc9c0\uc18d\ub41c\ub2e4.<\/p>\n

 \uaddc\uce59\uc774 \uaddc\uce59 \uc9d1\ud569\uc5d0\uc11c \uc0ad\uc81c\ub420 \ub54c \uc5b4\ub5a4 \uc77c\uc774 \uc77c\uc5b4\ub098\ub294\uac00? \uc218\ub9bd\ub41c \uc5f0\uacb0\uc5d0 \uc18d\ud558\ub294 \ud328\ud0b7\uc774 \uae30\ubcf8 \ubc84\ub9ac\uae30 \uaddc\uce59\uc5d0 \uc758\ud574 \ubc84\ub824\uc9c0\uae30 \uc804\uc5d0 \uc774\ub97c \uc218\uc6a9\ud558\uae30 \uc704\ud574 (\ub137\ud544\ud130 \ub4f1\uc774 \uc81c\uacf5\ud558\ub294)\uc5f0\uacb0 \ucd94\uc801 \uae30\ubc95\uc744 \uc0ac\uc6a9\ud558\ub294 \uacbd\uc6b0 \uc5f0\uacb0\uc740 \uc138\uc158\uc774 \uc218\ub9bd\ub418\uac8c \ud574\uc900 \ucd08\uae30 \uaddc\uce59\uc774 \uc0ad\uc81c \ub410\uc74c\uc5d0\ub3c4 \ubd88\uad6c\ud558\uace0 \uc5f4\ub9b0 \uc0c1\ud0dc\ub85c \ub0a8\uc744 \uc218 \uc788\ub2e4.<\/p>\n

 \uc218\ub9bd\ub41c TCP \uc5f0\uacb0\uc744 \uc5f4\ub9b0 \uc0c1\ud0dc\ub85c \uc720\uc9c0\ud558\uae30 \uc704\ud55c \uc5f0\uacb0\ucd94\uc801 \uae30\ubc95\uc740 \uae38\uac8c \uc720\uc9c0\ub418\ub294 TCP \uc138\uc158\uc5d0 \ub300\ud574 \ud6cc\ub96d\ud55c \ud574\uacb0\ucc45\uc744 \uc81c\uacf5\ud55c\ub2e4. \ud558\uc9c0\ub9cc \uc6f9\uc744 \ud1b5\ud574 HTTP \ub370\uc774\ud130\ub97c \uc804\uc1a1\ud558\uac70\ub098 \uba54\uc77c \uc11c\ubc84 \uac04\uc5d0 SMTP \ub370\uc774\ud130\ub97c \uc804\uc1a1\ud558\ub294 \uac83\uacfc \uac19\uc740 \ub2e8\uae30 \uc5f0\uacb0\uc758 \uacbd\uc6b0\ub294 \uc5b4\ub5a4\uac00? \uc0ac\uc6a9\uc790\uac00 \ubcf4\uace0\uc790 \ud558\ub294 \ubaa8\ub4e0 \uc6f9 \ub9c1\ud06c\ub9c8\ub2e4 \uc0c8\ub85c\uc6b4 SPA \ud328\ud0b7\uc744 \uc0dd\uc131\ud558\ub294 \uac83\uc740 \ubd88\ud3b8\ud560 \uac83\uc774\ub2e4. \ubaa8\ub4e0 \ub9c1\ud06c\uac00 \ubcc4\ub3c4\uc758 TCP \uc5f0\uacb0\uc744 \ud1b5\ud574 \uc804\uc1a1\ub41c\ub2e4\ub294 \uc0ac\uc2e4\uc740 \uc774 \ubb38\uc81c\ub97c \ub354 \uc545\ud654\uc2dc\ud0a8\ub2e4. \uc77c\ubc18\uc801\uc73c\ub85c SPA\ub294 \uc774\ub7f0 \uc11c\ube44\uc2a4\ub97c \ubcf4\ud638\ud558\ub294 \ub370 \uc801\ud569\ud558\uc9c0 \uc54a\ub2e4.<\/p>\n

 \ud574\uacb0\ucc45\uc758 \ud558\ub098\ub85c \uac00\ub839 \ud55c \uc2dc\uac04 \ub3d9\uc548 \uc0c8\ub85c\uc6b4 SPA \ud328\ud0b7\uc774 \ud544\uc694 \uc5c6\uac8c \ub2e8\uc21c\ud788 \ud074\ub77c\uc774\uc5b8\ud2b8 IP \uc8fc\uc18c\uc758 \uc2dc\uac04 \ub9cc\ub8cc\ub97c \ud655\uc7a5\ud558\ub294 \ubc29\ubc95\uc774 \uc788\ub2e4. \uc774\ub7f0 \ud655\uc7a5\uc774 SPA \uc720\ud6a8\uc131\uc744 \uc5b4\ub290 \uc815\ub3c4 \uac10\uc18c\uc2dc\ud0a4\uae34 \ud558\uc9c0\ub9cc \uc6f9\uc11c\ubc84\uac00 \uc911\uc694\ud55c \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc744 \uc2e4\ud589 \uc911\uc774\uace0 \ubcf4\uc548\uc774 \uac00\uc7a5 \uc911\uc694\ud55c \uace0\ub824\uc0ac\ud56d\uc77c \ub54c\ub294 \uc774\ub7f0 \ud574\uacb0\ucc45\uc774 \ud0c0\ub2f9\ud560 \uc218 \uc788\ub2e4.<\/p>\n","protected":false},"excerpt":{"rendered":"

 * \uacf5\uaca9 \uc218\ub2e8 \ucd95\uc18c  IDS\uc5d0 \uc758\ud574 \uac10\uc2dc\ub418\ub294 \uc2a4\ud478\ud551\ub41c \uacf5\uaca9\uc740 \uae0d\uc815 \uc624\ub958\ub97c \uc0dd\uc131\ud558\uc9c0 \ubabb\ud558\uba70, \uae30\ubcf8 \ubc84\ub9ac\uae30 \ud328\ud0b7 \ud544\ud130 \ub54c\ubb38\uc5d0 \uc138\uc158\uc774 \uc22b\ub9bd\ub420 \uc218 \uc5c6\uc73c\ubbc0\ub85c \uc218\ub9bd\ub41c TCP \uc138\uc158\uc744 \ud1b5\ud574 \uc2e4\uc81c \uacf5\uaca9\uc744 \uc804\ub2ec\ud558\ub824\ub294 \uc2dc\ub3c4\ub3c4 \uc2e4\ud328\ud55c\ub2e4. \uadf8\ub7ec\ubbc0\ub85c \ud3ec\ud2b8 \ub178\ud0b9\uacfc SPA\ub294 \ub124\ud2b8\uc6cc\ud06c \uc11c\ube44\uc2a4\uc5d0 \ub300\ud574 \uacf5\uaca9\uc744 \uac00\ud560 … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[52],"tags":[307,357,528,557,681,789],"_links":{"self":[{"href":"http:\/\/pchero21.com\/index.php?rest_route=\/wp\/v2\/posts\/3304"}],"collection":[{"href":"http:\/\/pchero21.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/pchero21.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/pchero21.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/pchero21.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3304"}],"version-history":[{"count":0,"href":"http:\/\/pchero21.com\/index.php?rest_route=\/wp\/v2\/posts\/3304\/revisions"}],"wp:attachment":[{"href":"http:\/\/pchero21.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3304"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/pchero21.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3304"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/pchero21.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3304"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}