SHA-256 Explained: How the SHA-2 Hash Function Works
A developer-friendly breakdown of the SHA-256 algorithm: compression function, rounds, avalanche effect, and output size.
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Tags: security, cryptography, hashing
SHA-256 Explained: How the Algorithm Works and When to Use It SHA-256 is the workhorse of modern cryptography. It's in TLS certificates, Bitcoin mining, code signing, software integrity verification, HMAC construction, and dozens of other contexts. Understanding how it works, and more importantly when to use it versus alternatives, is essential for any developer working with security-critical systems. What SHA-256 Does SHA-256 (Secure Hash Algorithm 256-bit) takes an input of any length and produces a fixed-size 256-bit (32-byte) output called a digest or hash. The key properties: One-way: Given a hash output, it's computationally infeasible to find the original input. This is called pre-image resistance. Collision resistant: It's computationally infeasible to find two different inputs…
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