Secure hash algorithm directory
MD5, SHA-1, HMAC and more
Cryptographic hash algorithmic resources.

The Secure Hash Algorithm Directory - MD5, SHA-1 and HMAC resources

The SHA-1 and MD5 Algorithms

SHA-1: The Secure Hash Algorithm (SHA) was developed by NIST and is specified in the Secure Hash Standard (SHS, FIPS 180). SHA-1 is a revision to this version and was published in 1994. It is also described in the ANSI X9.30 (part 2) standard. SHA-1 produces a 160-bit (20 byte) message digest. Although slower than MD5, this larger digest size makes it stronger against brute force attacks.
MD5: MD5 was developed by Professor Ronald L. Rivest in 1994. Its 128 bit (16 byte) message digest makes it a faster implementation than SHA-1.

In both cases, the fingerprint (message digest) is also non-reversable.... your data cannot be retrieved from the message digest, yet as stated earlier, the digest uniquely identifies the data.

To make deployment of this technology more straightforward, this site can offer a number of easy to use resources:

A series of APIs/DLLs (MD5/SHA-1 and HMAC)

The Hash Calculator (a useful hash utility)

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