![]() ![]() Identification is, in essence, difficult. The encryption used is recent: modern cryptography techniques are such that it is impossible to recognize an encrypted message from a random message, it is moreover a quality of a good encryption. The message is over-encrypted: several successive encodings / ciphers have been applied, the over-encryption tends to mask the characteristic signatures of the original encryption. Furthermore, nearly all messages can be stored in binary, identifying the encryption precisely is difficult. The message has a low entropy: it is composed of few distinct characters (a binary message containing only 0s and 1s has a low entropy). The possibilities become very numerous without a way to precisely identify the encryption. The message is too short: a message containing not enough characters does not allow a good frequency analysis to be performed. Sometimes the cipher identifier finds little or no relevant result, several reasons are possible:
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