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Unformatted text preview: • Answer: The number of different letters of which the keyword is constructed 4 Attacks on Attacks on Vigenere Vigenere Cipher Cipher • Determine the length of the keyword – Detect identical sequences of ciphertext letters – If two identical sequences of plaintext letters occur at a distance that is an integer multiple of the keyword length, then the two corresponding sequences of ciphertext letters will be identical – Conjecture that the keyword length is the greatest common divisor of distances between identical sequences of ciphertext 5 Recommended Readings Recommended Readings • Trappe : Chapter 2 • Stallings : Chapter 2...
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This note was uploaded on 09/15/2010 for the course CSE IT325 taught by Professor Maniklaldas during the Fall '09 term at Punjab Engineering College.
 Fall '09
 ManikLalDas

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