unbreakable cipher

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• Cipher — For other uses, see Cipher (disambiguation). Edward Larsson s rune cipher resembling that found on the Kensington Runestone. Also includes runically unrelated blackletter writing style and pigpen cipher. In cryptography, a cipher (or cypher) is… …   Wikipedia

• Vigenère cipher — The Vigenère cipher is a method of encrypting alphabetic text by using a series of different Caesar ciphers based on the letters of a keyword. It is a simple form of polyalphabetic substitution.The Vigenère (pronEng|ˌviːdʒɪˈnɛəɹ, veedj ih nair )… …   Wikipedia

• Stream cipher — The operation of the keystream generator in A5/1, a LFSR based stream cipher used to encrypt mobile phone conversations. In cryptography, a stream cipher is a symmetric key cipher where plaintext digits are combined with a pseudorandom cipher… …   Wikipedia

• Substitution cipher — In cryptography, a substitution cipher is a method of encryption by which units of plaintext are replaced with ciphertext according to a regular system; the units may be single letters (the most common), pairs of letters, triplets of letters,… …   Wikipedia

• Caesar cipher — The action of a Caesar cipher is to replace each plaintext letter with one fixed number of places down the alphabet. This example is with a shift of three, so that a B in the p …   Wikipedia

• Purple (cipher machine) — This article is about the Japanese cipher Purple, also known as AN 1 (citation for AN 1 nomenclature for Purple?). For other Japanese ciphers, such as JN 25 which played a part in the Battle of Midway, see Japanese naval codes. In the history of… …   Wikipedia

• XOR cipher — In cryptography, a simple XOR cipher is a relatively simple encryption algorithm that operates according to the principles::A oplus 0 = A,:A oplus A = 0,:(B oplus A) oplus A = B oplus 0 = B,where oplus denotes the exclusive disjunction (XOR)… …   Wikipedia

• Copiale cipher — Обложка рукописи Copiale cipher  немецкая зашифрованная рукопись второй половины XVIII века, содержащая информацию о тайном обществе окулистов. Содержание 1 …   Википедия

• Great Cipher — In the history of cryptography, the Great Cipher was a nomenclator cipher developed by the Rossignols, several generations of whom served the French Crown as cryptographers. It was excellent of its class and so was given this name; it was reputed …   Wikipedia

• The Alphabet Cipher — Lewis Carroll published The Alphabet Cipher in 1868, possibly in a children s magazine. It describes what is known as a Vigenère cipher, a well known scheme in cryptography. While Carroll calls this cipher unbreakable , Kasiski had published a… …   Wikipedia

• Copiale cipher — The Copiale cipher is an encrypted manuscript consisting of 75,000 handwritten characters filling 105 pages in a bound volume.[1] It is thought to date to between 1760 and 1780.[2] It was first examined at the German Academy of Sciences at Berlin …   Wikipedia