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urgentcomm » SMT

Keeping secrets

Published Monday, October 01, 2007

The need to communicate privately has existed since ancient times. Julius Caesar, for instance, employed a secret code to communicate with his generals where each letter of his original message was replaced by the letter three positions to the right in the alphabet. Thus the “key” was the number 3, and the cipher algorithm to decrypt the message was “shift to the left.” To be useful at all, the key must have been a secret known only to Caesar and his army, but it is hard to imagine that the code existed for long before being broken. In ...

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