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PrismKit

Vigenère Cipher

Local

Encrypt or decrypt with the Vigenère, Beaufort or autokey cipher and guess an unknown key with Kasiski and index-of-coincidence analysis.

Caesar Cipher

Shift letters with a Caesar, ROT13 or ROT47 cipher, or crack one by ranking all 25 shifts against English letter frequencies.

Classic Ciphers

Encrypt and decrypt with Atbash, rail fence, affine, Playfair and Bacon ciphers, with the rail zig-zag and Playfair key square shown.