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**CAP Cryptographic Analysis Program**

Column Transposition Cipher Help Presentation Press Enter or click on your mouse button to continue

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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 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

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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

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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

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

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