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
Babington Plot
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The Babington Plot was a plan in 1586 to assassinate Queen Elizabeth I, a Protestant, and put Mary, Queen of Scots, her Catholic cousin, on the English throne. It led to Mary's execution, a result of
Substitution cipher
…frequency distribution, and much longer plaintexts will then be required by the cryptanalyst. Nomenclator The forged nomenclator message used in the Babington Plot in 1586 A French nomenclator code table One once-common variant of the substitution cipher is the nomenclator. Named after the public official who…
Mary in captivity, c. 1578
Sir Francis Walsingham
The cipher code of Mary, Queen of Scots