broken cipher
1Cipher security summary — This article summarizes publicly known attacks against ciphers. Note that not all entries may be up to date. Table color key No known successful attacks Theoretical break Attack demonstrated in practice The Best attack column lists the complexity …
2Cipher (newuniversal) — Not to be confused with Cipher (comics) or Cypher (comics). Cipher Cover to newuniversal: shockfront #2, Marvel Publishing, circa 2008. Publication information …
3Vigenère 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 )… …
4Substitution 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,… …
5Caesar 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 …
6Purple (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… …
7Classical cipher — A cipher is a means of concealing a message, where letters of the message are substituted or transposed for other letters, letter pairs, and sometimes for many letters. In cryptography, a classical cipher is a type of cipher that was used… …
8Playfair cipher — The Playfair cipher or Playfair square is a manual symmetric encryption technique and was the first literal digraph substitution cipher. The scheme was invented in 1854 by Charles Wheatstone, but bears the name of Lord Playfair who promoted the… …
9Book cipher — A book cipher is a cipher in which the key is some aspect of a book or other piece of text; books being common and widely available in modern times, users of book ciphers take the position that the details of the key is sufficiently well hidden… …
10Stream cipher attack — Stream ciphers, where plaintext bits are combined with a cipher bit stream by an exclusive or operation (xor), can be very secure if used properly. However they are vulnerable to attack if certain precautions are not followed:*keys must never be… …
