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' tool source code. Except explicit open source licence (indicated CC / Creative Commons / free), any 'SHA-1' algorithm, applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any 'SHA-1' function (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and no data download, script, copy-paste, or API access for 'SHA-1' will be for free, same for offline use on PC, tablet, iPhone or Android ! dCode is free and online.

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 ?

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

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