CAP을 사용한 암호화, 복호화 네트워크 보안 레포트

소개글

CAP라는 암호화, 복호화 하는 프로그램을 사용하여 문장을 암호화, 복호화하는 과제입니다.
압축파일안에 과제와 CAP 프로그램, 그리고 그것을 사용해 나온 결과값등이 들어있으며,
이 프로그램을 이용하는 방법도 PDF파일로 들어가 있습니다.

컴파일 실행환경

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본문내용

⦁ Eve intercepted the following message between Alice and Bob :

qihihpkgqigqukybmpqiyqukfigqubgqukktmex
fimgbgobtftymtbnqutqkskmkftbgpigkimfimkpgkjp
tuktniyrppukpkkfpqihkthekqiorkppvutqvktmk
nibgohkyimkvkkskgdgivbquivatgvkkskmvbgbgqubp
htqqekiyvbqphrqbvbeegiqobskrjuijkvkvbeecrpq
utskqiqmxutmnkmqutgkskmqidkkjirmfkpptokpptyk
tgnpirgn


⦁ She knows that the message was enciphered using a keyword cipher, but it is clear that they are no longer using the keyword “please”. Find the key word and the Plaintext.

[Plain text] - keyword : thankyou

to bob
sent on the first of the month in the early morning
I am afraid that eve remains one or more sneps ahead of us she seems to be able to guess what we are doing before we even know It how can we ever win in this battle of wits but i will not give up hope we will just have to try harder than ever to keep our messages safe and sound



[ Plain text로 Decryption 과정]

1. Frequency Report를 클릭하여 Cipher text에 나오는 영어글자 빈도수를 체크한다....(중략)

압축파일 내 파일목록

CAP/CAPData/Words.txt
CAP/CAPData/centiban.TXT
CAP/HelpFiles/pptfiles/0_HelpTemplate.ppt
CAP/HelpFiles/pptfiles/ADFHelp.ppt
CAP/HelpFiles/pptfiles/ADFHelpl.pps
CAP/HelpFiles/pptfiles/ADFform.jpg
CAP/HelpFiles/pptfiles/AffineAnalysisHelp.ppt
CAP/HelpFiles/pptfiles/AffineHelp.pps
CAP/HelpFiles/pptfiles/AffineHelp.ppt
CAP/HelpFiles/pptfiles/AnagramHelp.ppt
CAP/HelpFiles/pptfiles/AutoPlainAttack.pps
CAP/HelpFiles/pptfiles/AutoPlainAttack.ppt
CAP/HelpFiles/pptfiles/BazeriesHelp.pps
CAP/HelpFiles/pptfiles/BazeriesHelp.ppt
CAP/HelpFiles/pptfiles/Blockmenu.jpg
CAP/HelpFiles/pptfiles/BreakingVHelp.pps
CAP/HelpFiles/pptfiles/BreakingVHelp.ppt
CAP/HelpFiles/pptfiles/Gamescreen.jpg
CAP/HelpFiles/pptfiles/General Help.pps
CAP/HelpFiles/pptfiles/General Help.ppt
CAP/HelpFiles/pptfiles/HelpTemplate.ppt
CAP/HelpFiles/pptfiles/KeywordCrypto.pps
CAP/HelpFiles/pptfiles/KeywordCrypto.ppt
CAP/HelpFiles/pptfiles/KeywordHelp.pps
CAP/HelpFiles/pptfiles/KeywordHelp.ppt
CAP/HelpFiles/pptfiles/MonitorScreen.jpg
CAP/HelpFiles/pptfiles/MultiliteralHelp.pps
CAP/HelpFiles/pptfiles/MultiliteralHelp.ppt
CAP/HelpFiles/pptfiles/ShiftAnalysisHelp.pps
CAP/HelpFiles/pptfiles/ShiftAnalysisHelp.ppt
CAP/HelpFiles/pptfiles/Thumbs.db
CAP/HelpFiles/pptfiles/VigenereHelp.pps
CAP/HelpFiles/pptfiles/VigenereHelp.ppt
CAP/HelpFiles/pptfiles/affineanalysisexample.jpg
CAP/HelpFiles/pptfiles/analysisbar.jpg
CAP/HelpFiles/pptfiles/analysisscreen.jpg
CAP/HelpFiles/pptfiles/autokeyciphertexthelp.pps
CAP/HelpFiles/pptfiles/autokeyciphertexthelp.ppt
CAP/HelpFiles/pptfiles/autokeyplainhelp.pps
CAP/HelpFiles/pptfiles/autokeyplainhelp.ppt
CAP/HelpFiles/pptfiles/autosolve.jpg
CAP/HelpFiles/pptfiles/breakingcolumnthelp.pps
CAP/HelpFiles/pptfiles/breakingcolumnthelp.ppt
CAP/HelpFiles/pptfiles/breakingdthelp.pps
CAP/HelpFiles/pptfiles/breakingdthelp.ppt
CAP/HelpFiles/pptfiles/breakinghillhelp.pps
CAP/HelpFiles/pptfiles/breakinghillhelp.ppt
CAP/HelpFiles/pptfiles/breakpermhelp.pps
CAP/HelpFiles/pptfiles/breakpermhelp.ppt
CAP/HelpFiles/pptfiles/ciphermenu.jpg
CAP/HelpFiles/pptfiles/ciphertextmenu.jpg
CAP/HelpFiles/pptfiles/columnthelp.pps
CAP/HelpFiles/pptfiles/columnthelp.ppt
CAP/HelpFiles/pptfiles/doublethelp.pps
CAP/HelpFiles/pptfiles/doublethelp.ppt
CAP/HelpFiles/pptfiles/gamemenu.jpg
CAP/HelpFiles/pptfiles/hillhelp.pps
CAP/HelpFiles/pptfiles/hillhelp.ppt
CAP/HelpFiles/pptfiles/integermenu.jpg
CAP/HelpFiles/pptfiles/integersscreen.jpg
CAP/HelpFiles/pptfiles/mainwindow.jpg
CAP/HelpFiles/pptfiles/monitormenu.jpg
CAP/HelpFiles/pptfiles/permhelp.pps
CAP/HelpFiles/pptfiles/permhelp.ppt
CAP/HelpFiles/pptfiles/plaintextmenu.jpg
CAP/HelpFiles/pptfiles/playfairhelp.pps
CAP/HelpFiles/pptfiles/playfairhelp.ppt
CAP/HelpFiles/pptfiles/playfairidhelp.pps
CAP/HelpFiles/pptfiles/playfairidhelp.ppt
CAP/HelpFiles/pptfiles/quit.jpg
CAP/HelpFiles/pptfiles/randommenu.jpg
CAP/HelpFiles/pptfiles/randomscreen.jpg
CAP/HelpFiles/pptfiles/return.jpg
CAP/HelpFiles/pptfiles/rotorcipherhelp.pps
CAP/HelpFiles/pptfiles/rotorcipherhelp.ppt
CAP/HelpFiles/pptfiles/simpleshifthelp.pps
CAP/HelpFiles/pptfiles/simpleshifthelp.ppt
CAP/HelpFiles/ADFHelp.pps
CAP/HelpFiles/AffineAnalysisHelp.pps
CAP/HelpFiles/AffineHelp.pps
CAP/HelpFiles/AutoPlainAttack.pps
CAP/HelpFiles/BazeriesHelp.pps
CAP/HelpFiles/BreakingVHelp.pps
CAP/HelpFiles/General Help.pps
CAP/HelpFiles/KeywordCrypto.pps
CAP/HelpFiles/KeywordHelp.pps
CAP/HelpFiles/MultiliteralHelp.pps
CAP/HelpFiles/ShiftAnalysisHelp.pps
CAP/HelpFiles/VigenereHelp.pps
CAP/HelpFiles/autokeyciphertexthelp.pps
CAP/HelpFiles/autokeyplainhelp.pps
CAP/HelpFiles/breakingcolumnthelp.pps
CAP/HelpFiles/breakingdthelp.pps
CAP/HelpFiles/breakinghillhelp.pps
CAP/HelpFiles/breakpermhelp.pps
CAP/HelpFiles/columnthelp.pps
CAP/HelpFiles/doublethelp.pps
CAP/HelpFiles/hillhelp.pps
CAP/HelpFiles/permhelp.pps
CAP/HelpFiles/playfairhelp.pps
CAP/HelpFiles/playfairidhelp.pps
CAP/HelpFiles/rotorcipherhelp.pps
CAP/HelpFiles/simpleshifthelp.pps
CAP/Words.txt
Assignment#1.hwp
CAP.zip
CAP_Manual_1.pdf
CAP_설명자료.pdf

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참고 자료

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