Tool to decrypt/encrypt with SHA1. SHA-1 hash is a footprint of 40 characters (hexadecimal) which is made to identify the initial data and guarantee its integrity, that is useful in cryptography.

SHA-1 - dCode

Tag(s) : Hashing Function, Modern Cryptography

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Encryption calculates a numeric footprint of 40 hexadecimal characters. The algorithm uses non linear functions, here are the 3 main ones:

$$ C(x,y,z) = (x \wedge y) \vee (\lnot x \wedge z) \\ P(x,y,z) = x \oplus y \oplus z \\ M(x,y,z) = (x \wedge y) \vee (x \wedge z) $$

With $ x,y,z $ portions of string to encode or fixed values among `0x67452301`, `0xEFCDAB89`, `0x98BADCFE`, `0x10325476`, `0xC3D2E1F0`...

__Example:__ `dCode` is crypted with the footprint `15fc6eed5ed024bfb86c4130f998dde437f528ee`.

As encryption is a hashing based on nonlinear functions, **there is no decryption method**. This means that to retrieve the password corresponding to a **sha-1** hash, there is no choice but to try all possible passwords!

Technically, this operation would take several thousand years, even on the most powerful computers in the world. However, the list of passwords used in real life is more restricted, and it becomes possible to precalculate the most likely fingerprints.

dCode uses its word databases (10 million potential passwords) to speed up this processing. However, if the password is rare, or combined with salting, it will probably not be found.

The hash is composed of 40 hexadecimal characters among `0123456789abcdef`.

The database search can be complicated by inserting `salt` to the word (a prefix or a suffix, or both). Indeed, if it is already difficult but possible to precalculate the fingerprints of all the words, it becomes even more difficult to precalculate with all possible prefixes and suffixes.

__Example:__ **SHA1**(`dCode`) = `15fc6eed5ed024bfb86c4130f998dde437f528ee` but **SHA1**(`dCodeSUFFIX`) = `9b63fcb31388acee8879018244a3d107033890f1`

Another (not recommended) variant is DOUBLE **SHA1**, that consists in applying **SHA1** twice.

A rainbow table is a database of words with all the pre-computed hashes and stored in order to accelerate and be able to parallelize the calculations of fingerprints.

List of magic **SHA-1** hashes:

String | MD5(String) |
---|---|

aa3OFF9m | 0e36977786278517984959260394024281014729 |

aaK1STfY | 0e76658526655756207688271159624026011393 |

aaO8zKZF | 0e89257456677279068558073954252716165668 |

aaroZmOk | 0e66507019969427134894567494305185566735 |

Bonus **SHA-1** like string that can also be evaluated at `0`: `0e00000000000000000000081614617300000000` or `0e00000000000000000000721902017120000000`

**SHA1** stands for Secure Hash Algorithm

By the National Security Agency in 1995

dCode retains ownership of the online "SHA-1" source code. Except explicit open source licence (indicated CC / Creative Commons / free), the "SHA-1" algorithm, the applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or the "SHA-1" 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, copy-paste, or API access for "SHA-1" are not public, same for offline use on PC, tablet, iPhone or Android ! Remainder : dCode is free to use.

Please, check our dCode Discord community for help requests!

NB: for encrypted messages, test our automatic cipher identifier!

- SHA-1 Decoder
- SHA1 Encoder
- How to encrypt using Secure Hash Algorithm (SHA-1) ?
- How to decrypt a SHA-1 hash?
- How to recognize SHA-1 ciphertext?
- What are the variants of the SHA-1 cipher?
- What is a rainbow table?
- What is the list of SHA1 Magic Hashes for PHP?
- What does SHA1 means?
- When SHA1 have been invented ?

sha1,sha,hash,secure,algorithm,password,double,salt,salted

Source : https://www.dcode.fr/sha1-hash

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