Presentation on theme: "CAP Cryptographic Analysis Program"— Presentation transcript:
1 CAP Cryptographic Analysis Program Column Transposition Cipher Help PresentationPress Enter or click on your mouse button to continue
2 Column TranspositionWrite the plaintext into a matrix by rows, then generate the ciphertext by selecting the columns in a given orderFor example, given the plaintext “encryption algorithms” and a 5x4 matrixKEY1234Select the columns in the orderEYOGTENPOHNCTARMCRILSRYPTIONALISLROHNPGTOYERMATCGORITHMS
3 Column KeyThe key for a column transposition is the number of columns and the order in which they are selectedBoth can be specified by a keyword:the length of the keyword is the number of columnsthe order of the letters in the keyword determinesthe order in which the columns are selected
4 Example KeyFor example, the keyword “general” defines a column transposition with 7 columnsTo define the order of columns assign each letter a number based on its order in the alphabetg e n e r a l4263715
5 Using CAPWhen you select Column Transposition, CAP presents a key window:
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