The Keccak hash function, and all its derivations, are cryptographic building blocks for the good of the society. We believe that open cryptography is a key technology for the digital society. The security of Keccak is key to the security of Ethereum and of many other digital projects. We worked a lot in analyzing its security and encouraged third- party cryptanalysis, with very positive results. The Keccak hash function is one of the most analyzed cryptographic functions, which gives a very high confidence on its security and resistance against all kind of attacks.