Free chat without registration to anybody - Validating in algorithm


Constructing a password that works for a given account requires a preimage attack, as well as access to the hash of the original password (typically in the file) which may or may not be trivial.

The algorithms were first published in 2001 in the draft FIPS PUB 180-2, at which time public review and comments were accepted.

In August 2002, FIPS PUB 180-2 became the new Secure Hash Standard, replacing FIPS PUB 180-1, which was released in April 1995.

Cryptographic hash functions are mathematical operations run on digital data; by comparing the computed "hash" (the output from execution of the algorithm) to a known and expected hash value, a person can determine the data's integrity.

For example, computing the hash of a downloaded file and comparing the result to a previously published hash result can show whether the download has been modified or tampered with.

SHA-512/224 and SHA-512/256 are also truncated versions of SHA-512, but the initial values are generated using the method described in Federal Information Processing Standards (FIPS) PUB 180-4. The SHA-2 family of algorithms are patented in US patent 6829355. It is thus generally recommended to switch to SHA-3 for 512 bit hashes and to use SHA-512/224 and SHA-512/256 instead of SHA-224 and SHA-256.