Keccak-256 Hash

Keccak-256 is the cryptographic hash function used by Ethereum to generate unique identifiers for data, including function signatures and addresses. It takes an input of any length and produces a fixed-size 256-bit output.

Because of its collision resistance, it is used to identify function selectors, ensuring that each function is uniquely mapped to its logic. The integrity of the Ethereum network relies heavily on the security of this hash function.

Understanding how it generates identifiers is essential for low-level contract development and interaction.