{"id":146,"date":"2010-04-17T23:30:09","date_gmt":"2010-04-18T08:30:09","guid":{"rendered":"\/blog\/?p=146"},"modified":"2023-09-21T09:39:19","modified_gmt":"2023-09-21T00:39:19","slug":"symmetric-key-%eb%8c%80%ec%b9%ad%ed%82%a4","status":"publish","type":"post","link":"https:\/\/hasu0707.duckdns.org\/blog\/?p=146","title":{"rendered":"Symmetric Key (\ub300\uce6d\ud0a4)"},"content":{"rendered":"\n<SPAN class=bblack>Symmetric Key (\ub300\uce6d\ud0a4)<\/SPAN><br \/><br \/>\uc624\ub798\ub41c \uc554\ud638\ud654 \ubc29\ubc95\uc774\ub2e4. \ub300\uce6d\ud0a4 \uc54c\uace0\ub9ac\uc998\uc744 \ud754\ud788 \ube44\ubc00\ud0a4 \uc54c\uace0\ub9ac\uc998\uc774\ub77c\uace0\ub3c4 \ubd80\ub978\ub2e4. A\uc640 B\ub9cc\uc774 \uc544\ub294 \ube44\ubc00\ud0a4\ub97c \uc774\uc6a9\ud574\uc11c \uc554\ud638\ud654 \ud1b5\uc2e0\uc744 \ud55c\ub2e4\ub294\ub370\uc11c \uae30\uc778\ud55c\ub2e4. \uc5ec\uae30\uc5d0\uc11c \ud575\uc2ec\uc740 \ub300\uce6d\ud0a4\ub77c\ub294\ub370 \uc788\ub2e4. \ud0a4\uac00 \ub300\uce6d\uc744 \uc774\ub8ec\ub2e4? \uc774\uac83\uc740 \uc554\ud638\ud654\ud0a4\uc640 \ubcf5\ud638\ud654\ud0a4\uac00 \ub3d9\uc77c\ud558\ub2e4(\ub300\uce6d\uc774\ub2e4)\ub77c\ub294 \ub370\uc11c \uc815\ub2f5\uc744 \uc5bb\uc744 \uc218 \uc788\ub2e4.<br \/><br \/><IMG src=\"http:\/\/www.secure.pe.kr\/lecture\/pki\/image1.jpg\"><br \/><br \/>\uc704\uc758 \uadf8\ub9bc\uc5d0\uc11c \ubcf4\ub4ef\uc774 \ub300\uce6d\ud0a4 \uc54c\uace0\ub9ac\uc998\uc5d0\uc11c\ub294 \uc554\ud638\ud654\ub97c \ud560 \ub54c \uc0ac\uc6a9\ud558\ub294 \ud0a4\uc640 \ubcf5\ud638\ud654\ub97c \ud560 \ub54c \uc0ac\uc6a9\ud558\ub294 \ud0a4\uac00 \ub3d9\uc77c\ud574\uc57c \ud55c\ub2e4. Alice\uac00 '1234'\ub97c \ud0a4\ub85c\uc11c \ub370\uc774\ud130\ub97c \uc554\ud638\ud654\ud588\ub2e4\uba74 Bob\uc5ed\uc2dc '1234'\ub77c\ub294 \ud0a4\ub97c \uc54c\uc544\uc57c\ub9cc \ubcf5\ud638\ud654\ub97c \ud560 \uc218 \uc788\ub2e4\ub294 \uac83\uc774\ub2e4. \uc774 \ub300\uce6d\ud0a4 \uc54c\uace0\ub9ac\uc998\uc744 \uc0ac\uc6a9\ud558\ub294 \ub300\ud45c\uc801\uc778 \uc554\ud638\ud654 \ud504\ub85c\ud1a0\ucf5c\ub85c\ub294 DES(Data Encryption Standard, 56bit, '\ub370\uc4f0' \ud504\ub85c\ud1a0\ucf5c\ub85c\ub3c4 \uc77d\ub294\ub2e4.), 3DES(Triple DES, 168bit)\uac00 \uc788\ub2e4. DES\ub97c \uc138\ubc88 \ubc18\ubcf5\ud558\ub294 3DES\ub294 \uc0c1\ub300\uc801\uc73c\ub85c \uc548\uc804\ud558\uae30\ub294 \ud558\uc9c0\ub9cc \ub2f9\uc5f0\ud788 \ud0a4 \uae38\uc774\uac00 \uae38\uc5b4\uc9d0\uc73c\ub85c\uc368 \ub354 \ub290\ub824\uc9c4\ub2e4\ub294 \ub2e8\uc810\uc774 \uc788\ub2e4. 56bit\ud0a4\ub97c \uc0ac\uc6a9\ud558\ub294 DES\ub294 \uc0ac\uc6a9\uc744 \uad8c\uc7a5\ud558\uc9c0 \uc54a\ub294\ub2e4. \ud604\uc7ac \ub300\ubd80\ubd84\uc758 \uc0c1\uc5c5\uc6a9 \uc554\ud638\ud654\ub294 128\ube44\ud2b8 \uc774\uc0c1\uc758 \uc554\ud638\ud654\uac00 \uad6c\ud604\ub418\ub294 \uac83\uc774 \uc77c\ubc18\uc801\uc774\ub2e4. <br \/><br \/>\ud558\uc9c0\ub9cc \uc774\ub7ec\ud55c \ub300\uce6d\ud0a4 \uc54c\uace0\ub9ac\uc998\uc740 \uc791\uc740 \ud0a4 \uae38\uc774\ub97c \uc0ac\uc6a9\ud568\uc73c\ub85c\uc368 \ube60\ub974\uac8c \uc554\ud638\ud654\uc640 \ubcf5\ud638\ud654\uac00 \uc774\ub8e8\uc5b4\uc9c4\ub2e4\ub294 \uc7a5\uc810\uc774 \uc788\uc9c0\ub9cc \uba87\uac00\uc9c0 \ubb38\uc81c\uc810\uc744 \uc548\uace0 \uc788\ub2e4.<br \/><br \/>\uccab\ubc88\uc9f8 \ubb38\uc81c\ub294 \uc554\ud638\ud654 \ud0a4 \uad50\ud658\uc758 \uc5b4\ub824\uc6c0\uc774\ub2e4. Alice\uac00 '1234'\ub77c\ub294 \uc554\ud638\ud654\ud0a4\ub97c \uc774\uc6a9\ud574\uc11c \uc554\ud638\ubb38\uc744 \ub9cc\ub4e4\uc5c8\ub2e4\uba74 \uc554\ud638\ud654\ub41c \uba54\uc2dc\uc9c0\ub97c \ubc1b\uc740 Bob\uc740 \uc5ed\uc2dc '1234'\ub77c\ub294 \ud0a4\ub97c \uc54c\uc544\uc57c\ub9cc \ud55c\ub2e4. Bob\uc740 \uc774 \ud0a4\ub97c \uc5b4\ub5bb\uac8c \uc54c \uc218 \uc788\uc744\uae4c? \uc774\ub54c \uc0ac\uc6a9\ub41c \uc554\ud638\ud654\ud0a4\ub294 \uc6f9\uc0ac\uc774\ud2b8\uc5d0 \uac8c\uc2dc\ud558\uac70\ub098 \uacf5\uc720\ud3f4\ub354\uc5d0 \uc800\uc7a5\ud574 \ub458\uc218\ub294 \uc5c6\ub2e4. Bob\uc774 \uc544\ub2cc \uc81c3\uc790\uac00 \uc774 Key\ub97c \uac00\uc838\uac04\ub2e4\uba74 Alice\uc758 \uc554\ud638\ubb38\uc744 \ud574\ub3c5\ud55c\ub294 \uac83\uc774 \uac00\ub2a5\ud558\uae30 \ub54c\ubb38\uc774\ub2e4. \uc804\uc790\uba54\uc77c\uc744 \uc0ac\uc6a9\ud574\uc11c key\ub97c \uc804\uc1a1\ud558\ub294 \uac83 \uc5ed\uc2dc \uc870\uae08\uc740 \ub0ab\uc9c0\ub9cc \ubc14\ub78c\uc9c1\ud55c \ubc29\ubc95\uc740 \uc544\ub2c8\ub2e4. \uacb0\uad6d \uc548\uc804\ud55c \ubc29\ubc95\uc740 \ub514\uc2a4\ucf13\uc5d0 \ub2f4\uc544\uc11c \uc9c1\uc811 \uc0c1\ub300\ubc29\uc5d0\uac8c \uac00\uc838\ub2e4 \uc8fc\ub294 \ubc29\ubc95\uc744 \uc0ac\uc6a9\ud574\uc57c \ud560 \uac83\uc774\ub2e4. \ubc88\uac70\ub85c\uc6b4 \uc77c\uc774 \uc544\ub2d0 \uc218 \uc5c6\ub2e4. \uc774\uac83\uc744 \ud574\uacb0\ud558\uae30 \uc704\ud574\uc11c SSL, Kerberos\ub4f1\uc758 \ub2e4\ub978 \uc554\ud638\ud654 \ubc29\ubc95\uacfc \ub354\ubd88\uc5b4 \ud0a4 \uad50\ud658\uc744 \uc81c\uacf5\ud558\uace0 \uc788\uc9c0\ub9cc \ub300\uce6d\ud0a4 \uc54c\uace0\ub9ac\uc998 \uc790\uccb4\ub85c\ub9cc \ubcf4\uc790\uba74 \ubb38\uc81c\uc810\uc774 \uc544\ub2d0 \uc218 \uc5c6\ub2e4.<br \/><br \/>\ub450\ubc88\uc9f8 \ubb38\uc81c\ub294 \ud0a4 \uad00\ub9ac\uc758 \uc5b4\ub824\uc6c0\uc744 \ub4e4 \uc218 \uc788\ub2e4. \uc608\ub97c \ub4e4\uc5b4\uc11c \uc6f9\uc0ac\uc774\ud2b8 \ud558\ub098\uac00 \uc788\uace0 1\ub9cc\uba85\uc758 \ud68c\uc6d0\uc774 \uc788\ub2e4\uace0 \ud558\uc790. 1\ub9cc\uba85\uc758 \ubaa8\ub4e0 \ud68c\uc6d0\ub4e4\uc740 \uc6f9\uc11c\ubc84\uc5d0 \uc2e0\uc6a9\uce74\ub4dc\ubc88\ud638, \uc720\ud6a8\uae30\uac04, \ube44\ubc00\ubc88\ud638 \ub4f1\uc744 \uc804\uc1a1\ud574\uc57c \ud558\ub294\ub370 \ub2f9\uc5f0\ud788 \uace0\ub824\ud560 \uc810\uc740 \uc6f9\uc11c\ubc84\uac00 \uc544\ub2cc \uc5b4\ub290 \ub204\uad6c\ub3c4 \uc774 \ub370\uc774\ud130\ub97c \uc5f4\uc218 \uc788\uc5b4\uc11c\ub294 \uc548\ub41c\ub2e4. \uc774 \uacbd\uc6b0 \ud0a4\ub294 \uba87 \uac1c\uac00 \ud544\uc694\ud560\uae4c? \uc6f9\uc11c\ubc84\uac00 \ud55c\ub300\uc774\ub2c8 \ud0a4\ub3c4 \ud55c \uac1c\ub9cc \uc788\uc73c\uba74 \uc88b\uaca0\uc9c0\ub9cc \uc544\uc27d\uac8c\ub3c4 \ud0a4\ub294 1\ub9cc\uac1c\uac00 \uc788\uc5b4\uc57c \ud55c\ub2e4. 1\ub9cc\uba85\uc758 \ud68c\uc6d0\ub4e4\uc5d0\uac8c \uac01\uac01 \uace0\uc720\ud55c \ube44\ubc00\ud0a4\ub97c \ud560\ub2f9\ud574 \uc8fc\uc5b4\uc57c \ud55c\ub2e4\ub294 \uac83\uc774\ub2e4. Alice\ub77c\ub294 \ud68c\uc6d0\uacfc Eve\ub77c\ub294 \ud68c\uc6d0\uc758 \ud0a4\uac00 \ub3d9\uc77c\ud558\ub2e4\uba74 Alice\uac00 \uc554\ud638\ud654\ud55c \ub370\uc774\ud130\ub97c Eve\ub3c4 \ud574\ub3c5\ud560 \uc218 \uc788\uae30 \ub54c\ubb38\uc774\ub2e4. \uadf8\ub807\uac8c \ub418\uba74 Confidentiality\ub294 \uae68\uc9c0\uace0 \ub9cc\ub2e4.<br \/><br \/>\uc774\uac83\uc5d0 \ube44\ud574 PKI\ub294 \ubcf4\ub2e4 \uc720\uc5f0\ud55c \uad00\ub9ac\ub97c \uac00\ub2a5\ud558\uac8c \ub9cc\ub4e0\ub2e4. \ud558\uc9c0\ub9cc \ub2e4\uc74c\uc7a5\uc5d0\uc11c \uc124\uba85\ud560 PKI\ub294 \ub300\uce6d\ud0a4 \ubc29\uc2dd\uc5d0 \ube44\ud574\uc11c \ud0a4 \uae38\uc774\uac00 \uae38\uace0 \uc54c\uace0\ub9ac\uc998\uc774 \ubcf5\uc7a1\ud558\uc5ec \uc131\ub2a5\uba74\uc5d0\uc11c \uc0c1\ub300\uc801\uc73c\ub85c \ub5a8\uc5b4\uc9c4\ub2e4. \uadf8\ub7f0 \uc774\uc720\ub85c \ud604\uc7ac \uc0ac\uc6a9\ub418\ub294 \ud615\ud0dc\ub97c \ubcf4\uba74 \ub300\uce6d\ud0a4 \uc54c\uace0\ub9ac\uc998\uacfc \uacf5\uc6a9\ud0a4 \uc54c\uace0\ub9ac\uc998\uc774 \uacf5\uc874\ud558\uc5ec \uc4f0\uc774\uace0 \uc788\ub294 \ud615\ud0dc\uc774\ub2e4.&nbsp;\n","protected":false},"excerpt":{"rendered":"<p>Symmetric Key (\ub300\uce6d\ud0a4) \uc624\ub798\ub41c \uc554\ud638\ud654 \ubc29\ubc95\uc774\ub2e4. \ub300\uce6d\ud0a4 \uc54c\uace0\ub9ac\uc998\uc744 \ud754\ud788 \ube44\ubc00\ud0a4 \uc54c\uace0\ub9ac\uc998\uc774\ub77c\uace0\ub3c4 \ubd80\ub978\ub2e4. A\uc640 B\ub9cc\uc774 \uc544\ub294 \ube44\ubc00\ud0a4\ub97c \uc774\uc6a9\ud574\uc11c \uc554\ud638\ud654 \ud1b5\uc2e0\uc744 \ud55c\ub2e4\ub294\ub370\uc11c \uae30\uc778\ud55c\ub2e4. \uc5ec\uae30\uc5d0\uc11c \ud575\uc2ec\uc740 \ub300\uce6d\ud0a4\ub77c\ub294\ub370 \uc788\ub2e4. \ud0a4\uac00 \ub300\uce6d\uc744 \uc774\ub8ec\ub2e4? \uc774\uac83\uc740 \uc554\ud638\ud654\ud0a4\uc640 \ubcf5\ud638\ud654\ud0a4\uac00 \ub3d9\uc77c\ud558\ub2e4(\ub300\uce6d\uc774\ub2e4)\ub77c\ub294 \ub370\uc11c \uc815\ub2f5\uc744 \uc5bb\uc744 \uc218 \uc788\ub2e4. \uc704\uc758 \uadf8\ub9bc\uc5d0\uc11c \ubcf4\ub4ef\uc774 \ub300\uce6d\ud0a4 \uc54c\uace0\ub9ac\uc998\uc5d0\uc11c\ub294 \uc554\ud638\ud654\ub97c \ud560 \ub54c \uc0ac\uc6a9\ud558\ub294 \ud0a4\uc640 \ubcf5\ud638\ud654\ub97c \ud560 \ub54c \uc0ac\uc6a9\ud558\ub294 \ud0a4\uac00 \ub3d9\uc77c\ud574\uc57c \ud55c\ub2e4. Alice\uac00 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[12],"tags":[],"class_list":["post-146","post","type-post","status-publish","format-standard","hentry","category-computing_security"],"_links":{"self":[{"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=\/wp\/v2\/posts\/146","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=146"}],"version-history":[{"count":0,"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=\/wp\/v2\/posts\/146\/revisions"}],"wp:attachment":[{"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=146"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=146"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=146"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}