The SHA-1 hash of c99adeac98b3a4f3fd267644f39d0b1b3ad751e556F91807D75B1EBC1ECA42B4A796E3C7B35D81D8 is e791c8f22803de9b0f5c92c44177272c5c32bae0
You can attempt to reverse the SHA-1 hash which was just generated, to reverse it into the originally provided string:
Reverse a SHA-1 hash
Feel free to experiment SHA-1 hashing with more strings. Just enter a new string and submit the form to convert it into another SHA-1 hash.
Convert a string to a SHA-1 hash
What is a SHA-1 hash?
SHA-1 (Secure Hash Algorithm, 1st version) is an algorithm which converts a given sequence of characters into another unique sequence of characters, with a fixed length, called "hash". For instance, the SHA-1 hash of the word password is 5baa61e4c9b93f3f0682250b6cf8331b7ee68fd8.
These hashes are mostly used to validate file integrity, to encrypt sensitive data (like passwords), and to generate unique identifiers.
Is it secure?
SHA-1 hashes are theoretically impossible to reverse directly, ie, it is not possible to retrieve the original string from a given hash using only mathematical operations.
Most web sites and applications store their user passwords into databases with SHA-1 encryption. This method appears to be safe as it seems impossible to retrieve original user passwords if, say, a hacker manages to have a look at the database content.
Unfortunately, there is a way to decrypt a SHA-1 hash, using a dictionary populated with strings and their SHA-1 counterpart. As most users use very simple passwords (like "123456", "password", "abc123", etc), SHA-1 dictionaries make them very easy to retrieve.
This website uses a SHA-1 reverse dictionary containing several millions of entries, which you can use with SHA-1 hashes from your application.
If some of the hashes you enter can be reversed, consider using another way of generating hashes, like using stronger algorithms (SHA-2, Whirlpool, etc), combining algorithms, and using a "salt".
Links
- MD5 Center
- Convert and reverse MD5 hashes.
- Cryptography Center
- Encrypt, decrypt, convert, encode and decode text.
- Definition of SHA-1 on Wikipedia.org
- Learn more about SHA-1 hashes by reading the related article on Wikipedia.org