Substitution cipher
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In cryptography, a substitution cipher is a method of encrypting that creates the ciphertext by replacing units of the plaintext in a defined manner, with the help of a key; the "units" may be single
The forged nomenclator message used in the Babington Plot in 1586
A French nomenclator code table
Enigma cipher machine as used by the German military in World War II
Vigenère cipher
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The Vigenère cipher is a method of encrypting alphabetic text where each letter of the plaintext is encoded with a different Caesar cipher, whose increment is determined by the corresponding letter of
Substitution cipher
…1585, it was considered unbreakable until 1863, and indeed was commonly called le chiffre indéchiffrable (French for "indecipherable cipher"). In the Vigenère cipher, the first row of the tableau is filled out with a copy of the plaintext alphabet, and successive rows are simply shifted one place to the left. (Such…
The Vigenère cipher is named after Blaise de Vigenère (pictured), although Giovan Battista Bellaso had invented it before Vigenère described his autokey cipher.
Cryptographic slide rule used as a calculation aid by the Swiss Army between 1914 and 1940
Confederate cipher wheel, captured at the surrender of Mobile, Alabama, in May 1865 – National Cryptologic Museum