Design of Secure Hash Algorithms

In the following section, you will be introduced to the design of SHA-256 and SHA-3. Both of these are used in Bitcoin and Ethereum, respectively. Ethereum does not use NIST Standard SHA-3, but Keccak, which is the original algorithm presented to NIST. NIST, after some modifications, such as an increase in the number of rounds and simpler message padding, standardized Keccak as SHA-3.