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#Autokey Cipher

2 articles with this tag.

A visual representation of breaking the Autokey Cipher
Basic Classic Symmetric Breakers Intermediate

Breaking the Autokey Cipher

The Autokey cipher defeats Kasiski examination and the Index of Coincidence by never repeating its key. But the short priming key that starts everything off is still just a handful of letters, and one wrong guess collapses the entire decryption for you.

34 min read

A visual representation of the Autokey Cipher
Basic Classic Symmetric Intermediate

The Autokey Cipher

Learn about the Autokey cipher, the Vigenère variant that fixes the repeating-key weakness by folding the plaintext itself into the key stream. That closes the door on Kasiski examination.

14 min read

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