Saturday, October 9, 2010

Keyword Number Ciphers

Sometimes ciphers are used to conceal numbers, especially telephone numbers, addresses, weights, and money amounts. Keyword number ciphers are the most common system for encrypting numbers and are used in the same manner as keyword alphabet ciphers. Normally these keywords are ten-letter words with no repeat letters.


For example if the number we were trying to conceal was a locker combination
29-14-35

The cipher would be

LSBCAK

To decipher the recipient one must know the keyword.

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