MD5 hash for « 15b38e865ee1ddefda955939d0bd5c8e 337605c06242c094d64de46e2926fbc6 7548af65aca74df277e75a966fb68c23 10d0a3f80aa1216d13643e26046c164a 416c46988325682c379a0998412f39ea 74c3fe91c70fbae5eb2bd35e1825da19 8b15f1947bd0eb53ebc682a38de89ef1 »

What is a MD5 hash?

MD5 (Message Digest algorithm, 5th 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 MD5 hash of the word password is 5f4dcc3b5aa765d61d8327deb882cf99.

These hashes are mostly used to validate file integrity, to encrypt sensitive data (like passwords), and to generate unique identifiers.

Is it secure?

MD5 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 MD5 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 MD5 hash, using a dictionary populated with strings and their MD5 counterpart. As most users use very simple passwords (like "123456", "password", "abc123", etc), MD5 dictionaries make them very easy to retrieve.

This website uses a MD5 reverse dictionary containing several millions of entries, which you can use with MD5 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".