CAP Cryptographic Analysis Program

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CLASSICAL ENCRYPTION TECHNIQUES

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CAP Cryptographic Analysis Program

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CAP Cryptographic Analysis Program Column Transposition Cipher Help Presentation Press Enter or click on your mouse button to continue

Column Transposition Write the plaintext into a matrix by rows, then generate the ciphertext by selecting the columns in a given order For example, given the plaintext “encryption algorithms” and a 5x4 matrix KEY 1 2 3 4 Select the columns in the order 4 - 2 - 1 - 3 E Y O G T E N P O H N C T A R M C R I L S R Y P T I O N A L I S L R O H N P G T O Y E R M A T C G O R I T H M S

Column Key The key for a column transposition is the number of columns and the order in which they are selected Both can be specified by a keyword: the length of the keyword is the number of columns the order of the letters in the keyword determines the order in which the columns are selected

Example Key For example, the keyword “general” defines a column transposition with 7 columns To define the order of columns assign each letter a number based on its order in the alphabet g e n e r a l 4 2 6 3 7 1 5

Using CAP When you select Column Transposition, CAP presents a key window: