An autokey cipher (also known as the autoclave cipher) is a cipher that incorporates the message (the plaintext) into the key. The key is generated from...

polyalphabetic cipher called an autokey cipher – because its key is based on the original plaintext – before the court of Henry III of France. The cipher now known...

plaintext into the key is also known as an autokey cipher or autoclave cipher. In a synchronous stream cipher a stream of pseudorandom digits is generated...

ciphers, including the Vigenère cipher and Blaise de Vigenère's less well-known autokey cipher. All polyalphabetic ciphers based on the Caesar cipher...

theoretically unbreakable cipher must have keys which are at least as long as the plaintext, and used only once: one-time pad. Autokey cipher Cover-coding Encryption...

encryption and decryption. The autokey cipher, which mixes plaintext with a key to avoid periodicity. The running key cipher, where the key is made very...

In cryptography, a Caesar cipher, also known as Caesar's cipher, the shift cipher, Caesar's code, or Caesar shift, is one of the simplest and most widely...

turn be extended, and so on (for more detailed explanation refer to Autokey cipher). Eventually it is likely that the source of the running key will be...

Vigenère cipher is named after Blaise de Vigenère, although Giovan Battista Bellaso had invented it before Vigenère described his autokey cipher. Bellaso...

In cryptography, a transposition cipher (also known as a permutation cipher) is a method of encryption which scrambles the positions of characters (transposition)...

Bacon's cipher or the Baconian cipher is a method of steganographic message encoding devised by Francis Bacon in 1605. In steganography, a message is...

Vigenère cipher, the Autokey cipher and the Alberti cipher. In the later stages of the competition, the ADFGVX cipher, the Solitaire cipher, the Double...

The Enigma machine is a cipher device developed and used in the early- to mid-20th century to protect commercial, diplomatic, and military communication...

The Playfair cipher or Playfair square or Wheatstone–Playfair cipher is a manual symmetric encryption technique and was the first literal digram substitution...

Hill cipher is a polygraphic substitution cipher based on linear algebra. Invented by Lester S. Hill in 1929, it was the first polygraphic cipher in which...

pigpen cipher (alternatively referred to as the masonic cipher, Freemason's cipher, Rosicrucian cipher, Napoleon cipher, and tic-tac-toe cipher) is a geometric...

Palindrome Pangram Sequence alignment Atbash cipher Autokey cipher Bazeries cylinder Bible code Bifid cipher Caesar cipher Cardan grille Enigma machine Frequency...

The Great Cipher (French: Grand chiffre) was a nomenclator cipher developed by the Rossignols, several generations of whom served the French monarchs...

A book cipher is a cipher in which each word or letter in the plaintext of a message is replaced by some code that locates it in another text, the key...

keyword rendered the cipher text subject to modular arithmetic. During the Crimean War of the 1850s, Babbage broke Vigenère's autokey cipher as well as the...

Caesar cipher ROT13 Affine cipher Atbash cipher Keyword cipher Polyalphabetic substitution Vigenère cipher Autokey cipher Homophonic substitution cipher Polygraphic...

The rail fence cipher (also called a zigzag cipher) is a classical type of transposition cipher. It derives its name from the manner in which encryption...

In cryptography, a classical cipher is a type of cipher that was used historically but for the most part, has fallen into disuse. In contrast to modern...

became widely known as the "Vigenère cipher". In 1567 and 1568, Vigenère created a different, stronger autokey cipher, which he published in 1586 in his...

polyalphabetic cipher is a substitution, using multiple substitution alphabets. The Vigenère cipher is probably the best-known example of a polyalphabetic cipher, though...

The Aristocrat Cipher is a type of monoalphabetic substitution cipher in which plaintext is replaced with ciphertext and encoded into assorted letters...

null cipher, also known as concealment cipher, is an ancient form of encryption where the plaintext is mixed with a large amount of non-cipher material...

The Two-square cipher, also called double Playfair, is a manual symmetric encryption technique. It was developed to ease the cumbersome nature of the large...

the principles of information theory. Digital versions of one-time pad ciphers have been used by nations for critical diplomatic and military communication...

used as a basic cipher called the Polybius cipher. This cipher is quite insecure by modern standards, as it is a substitution cipher with characters being...