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Cipher Identifier

Tool to identify/recognize the type of encryption/encoding applied to a message (more 200 ciphers/codes are detectable) in order to quickly decrypt/decode it.

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Cipher Identifier -

Tag(s) : Cryptography, Cryptanalysis, dCode

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A suggestion ? a feedback ? a bug ? an idea ? Write to dCode!

Please, check our dCode Discord community for help requests!
NB: for encrypted messages, test our automatic cipher identifier!

Thanks to your feedback and relevant comments, dCode has developed the best 'Cipher Identifier' tool, so feel free to write! Thank you!

# Cipher Identifier

## Answers to Questions (FAQ)

### How to decrypt a cipher text?

To decrypt / decipher an encoded message, it is necessary to know the encryption used (or the encoding method, or the implemented cryptographic principle). Without knowing the technique chosen by the sender of the message, it is impossible to decrypt it (or decode it). Knowing the encryption (or encoding, or code) is therefore the first step to start the decryption (or decoding) process.

dCode therefore proposes, on this page above, an artificial intelligence tool dedicated to the automatic recognition/identification of encryption and direct links to tools capable of deciphering the message/text.

### How to recognize a cipher?

To recognize/guess the type of encryption/encoding used to encrypt/encode a message, dCode uses several detection/cryptanalysis methods:

frequency analysis: which characters of the message appear most often? In what proportion? Which characters do not appear? This analysis can be carried out for all the characters (but often the letters A-Z and the numbers 0-9 allow to eliminate many methods of ciphers/coding). The analysis of bigrams or trigrams (or more generally group of letters) makes it possible to refine the cryptanalysis, the presence or absence of certain groups of letters are clues.

— the coincidence index: how random are the characters of the message? Intelligible messages (in English) tend to favor certain letters and do not use the E in the same way as the X (much rarer).

— signature search: certain ciphers / encodings have characteristic marks, a signature which makes them identifiable.

Example: The base64 code contains all the possible numbers and letters (upper and lower case) distributed fairly evenly but 3 times out of 4, it ends with the sign =.

When the message is accompanied by instructions or clues, some keywords can trigger more results from the dCode database. NB: do not indicate known plaintext.

### Why does the detector display a warning?

Sometimes the cipher identifier finds little or no relevant result, several reasons are possible:

— The message is too short: a message containing not enough characters does not allow a good frequency analysis to be performed. The possibilities become very numerous without a way to precisely identify the encryption.

— 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). Furthermore, nearly all messages can be stored in binary, identifying the encryption precisely is difficult.

— 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.

— 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. Identification is, in essence, difficult.

— The encryption used is very rare: dCode can detect nearly 200 different ciphers and continues to improve thanks to your feedback and messages, but it is not impossible that some ciphers are still unknown/missing.

### Why does the analyzer/recognizer not detect my cipher method?

Sometimes the recognizer algorithm (based on artificial intelligence and machine learning) finds multiple signals, distinctive signs from several cipher types, and returns approximate results. Please contact us with your cipher message, the original message and the encryption method used so that dCode can teach the analyzer this encryption for future times. The more data there is, the more accurate the detection will be.

### How does the cipher identifier work?

The program is based on a neural network type architecture, more precisely a multilayer perceptron (MLP). At the input layer there are the coded messages (with ngrams), and at the output layer the different types of known and referenced ciphers on dCode. Regularly the database is updated and new ciphers are added which allows to refine the results.

## Source code

dCode retains ownership of the "Cipher Identifier" source code. Except explicit open source licence (indicated Creative Commons / free), the "Cipher Identifier" algorithm, the applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or the "Cipher Identifier" functions (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and all data download, script, or API access for "Cipher Identifier" are not public, same for offline use on PC, mobile, tablet, iPhone or Android app!
Reminder : dCode is free to use.

## Cite dCode

The copy-paste of the page "Cipher Identifier" or any of its results, is allowed as long as you cite dCode!
Cite as source (bibliography):
Cipher Identifier on dCode.fr [online website], retrieved on 2022-08-08, https://www.dcode.fr/cipher-identifier

## Need Help ?

Please, check our dCode Discord community for help requests!
NB: for encrypted messages, test our automatic cipher identifier!

## Questions / Comments

Thanks to your feedback and relevant comments, dCode has developed the best 'Cipher Identifier' tool, so feel free to write! Thank you!

https://www.dcode.fr/cipher-identifier
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