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One-way function producing a fixed-size digest.

Definition

Hash functions map input data to a fixed-size digest. For passwords, specialized password hashing with salts and work factors reduces offline guessing.

In plain English One-way function producing a fixed-size digest.

Why this matters

Why it matters: Poor hashing or missing salts can enable rapid cracking of leaked credentials.

Example

Example: Salted password hashing with a slow KDF (e.g., Argon2) to resist offline attacks.