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SHA-1
Tool to decrypt/encrypt with SHA1 (Secure Hash Algorithm) with 40 characters (in hexadecimal) often used in cryptography.
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SHA-1 - dCode
Tag(s) : Hashing Function, Modern Cryptography
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- Informatics
- Algorithm
- Hashing Function
- SHA-1
SHA-1 Decoder
SHA1 Encoder
Answers to Questions (FAQ)
What is SHA-1? (Definition)
The SHA-1 hash (for Secure Hash Algorithm) is a hashing algorithm providing a hash of 40 hexadecimal characters.
Reminder: hashing is a technique which, from a starting chain, provides a unique fingerprint, making it possible to identify the initial data and guarantee its integrity.
How to encrypt using Secure Hash Algorithm (SHA-1) ?
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 (and others)
Example: dCode is encrypted with the footprint 15fc6eed5ed024bfb86c4130f998dde437f528ee.
How to decrypt a SHA-1 hash?
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.
How to recognize SHA-1 ciphertext?
The hash is composed of 40 hexadecimal characters among 0123456789abcdef.
What are the variants of the SHA-1 cipher?
The database search can be complicated by inserting a salt to the word. The salt is usually a prefix or a suffix. 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 (the first time on the original string, then the second time on the computed hash).
What is a rainbow table?
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.
What is the list of SHA1 Magic Hashes for PHP?
List of magic SHA-1 hashes:
String | MD5(String) |
---|---|
aa3OFF9m | 0e36977786278517984959260394024281014729 |
aaK1STfY | 0e76658526655756207688271159624026011393 |
aaO8zKZF | 0e89257456677279068558073954252716165668 |
aaroZmOk | 0e66507019969427134894567494305185566735 |
Bonus magic SHA-1 like string that can also be evaluated at 0: 0e00000000000000000000081614617300000000 or 0e00000000000000000000721902017120000000
What does SHA1 letters mean?
SHA1 stands for Secure Hash Algorithm (version 1)
When was SHA1 invented?
SHA1 was proposed by the National Security Agency in 1995.
Source code
dCode retains ownership of the "SHA-1" source code. Except explicit open source licence (indicated Creative Commons / free), the "SHA-1" algorithm, the applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, breaker, 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, or API access for "SHA-1" are not public, same for offline use on PC, mobile, tablet, iPhone or Android app!
Reminder : dCode is free to use.
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Exporting results as a .csv or .txt file is free by clicking on the export icon
Cite as source (bibliography):
SHA-1 on dCode.fr [online website], retrieved on 2024-07-06,
Summary
- SHA-1 Decoder
- SHA1 Encoder
- What is SHA-1? (Definition)
- 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 letters mean?
- When was SHA1 invented?
Similar pages
- SHA-256
- MD5
- Hash Function
- SHA-512
- MD4
- PBKDF2 Hash
- Diffie-Hellman Key Exchange
- DCODE'S TOOLS LIST
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Keywords
sha1,sha,hash,secure,algorithm,password,salt,salted
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