What is md5?
MD5 (Message-Digest Algorithm 5) is a world-wide used cryptographic hash function, wich produces an 128-bit hash value. MD5 was developed in 1991 von Ronald L. Rivest. The calculated md5 hash sums are used, for example to verify the integrity of files.
The 128-bit MD5 hashes are usually noted as a 32-digit hexadecimal number.