SHA

ELI5 — The Vibe Check

SHA (Secure Hash Algorithm) is a family of blenders for data. You put anything in — a document, a password, a whole movie — and get a fixed-size fingerprint out. SHA-256 gives you a 256-bit fingerprint. Change one letter in the input and the whole fingerprint changes completely.

Real Talk

SHA (Secure Hash Algorithm) is a family of cryptographic hash functions developed by the NSA. SHA-256 and SHA-512 are widely used for data integrity verification, digital signatures, and certificate fingerprinting. SHA-1 is deprecated due to collision vulnerabilities.

Show Me The Code

import { createHash } from 'crypto';

const hash = createHash('sha256')
  .update('Hello, world!')
  .digest('hex');

console.log(hash);
// '315f5bdb76d078c43b8ac0064e4a0164612b1fce77c869345bfc94c75894edd3'

When You'll Hear This

"Use SHA-256 to verify the file integrity." / "SHA-1 is broken — upgrade to SHA-256."