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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.
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.
Learn about the Beaufort cipher, a Vigenère variant that flips the subtraction around to become its own inverse. The same formula both encrypts and decrypts.
Learn how the Enigma machine worked: the WWII German cipher machine that produced a different substitution alphabet for every single keystroke. Its defeat by Alan Turing and Bletchley Park changed the course of the war.
The Vigenère Cipher: A Journey Through History and Modern Applications.
