Secure

/ˌes-eɪtʃ-ˈfɪf-twɛl-v/

n. “The heavyweight of hashes.”

/ˌes-eɪtʃ-eɪ-ˈtuː-fɪfti-sɪks/

n. “Proves what you have… and that it hasn’t been quietly touched since.”

SHA256 is a modern cryptographic hashing algorithm designed for a world that learned its lessons the hard way. Where MD5 trusted too easily and paid for it later, SHA256  assumes the environment is hostile, the inputs are adversarial, and someone is always trying to cheat the math.