128-bit hash function. Fast but cryptographically broken. Use only for non-security purposes like checksums or data integrity verification in non-adversarial scenarios.

160-bit hash function. Deprecated for cryptographic use due to collision vulnerabilities. Still acceptable for non-critical applications.

Part of the SHA-2 family. Cryptographically secure and widely used for digital signatures, certificate generation, and blockchain applications. SHA-256 is the most commonly used.

Hash-based Message Authentication Code. Uses a secret key with the hash function to provide both data integrity and authentication. Commonly used in API authentication and secure messaging.