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Entries Tagged ‘Symmetric Encryption’

XOR and the One-Time Pad

May.29, 2008 in Cryptography

Some of my students have asked why we always use XOR (Exclusive OR) in encrypting plaintext into ciphertext. To answer this question, please take a look first at the output of the various combinations of inputs for XOR function. Input A Input B A XOR B 1 1 0 1 0 1 0 1 1 […]

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Work Factor : Uncovering keys in cryptosystems

Mar.24, 2008 in Cryptography

Work Factor is defined as the amount of effort (usually measured in units of time) needed to break a cryptosystem. The Work Factor of a cryptosystem is related to its key-length and the working mechanism used (encryption and decryption algorithms). For example, if the brute force attack method is used to break the system (trying […]

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