SHA3/512 Hash

SHA-3 512 bit Hash Generator

SHA3 is based on keccak algorithm.

From the standard of SHA3 published by NIST, SHA3 will be grouped as:

Hash Functions (fixed output length): - SHA3-224 - SHA3-256 - SHA3-384 - SHA3-512

Sponge Functions (variable output length): - SHAKE256 - SHAKE512

What part of Keccak changed for this SHA3 standard?

• Padding Scheme Changed : to support fixed-length hashes and sponges, and to support tree hashing
• More capacities: Keccak originally only has 256 and 512 capacities
• Using tunable parameter which can make security / performance tradeoff

Although it is named SHA3, SHA3 is internally different from its predecessors such as SHA1 and SHA2.

SHA3 use Sponge construction, not Merke-Damgård construction which used on MD4, MD5, RIPE-MD, RIPE-MD160, SHA0, SHA1, SHA2.