Cryptographic Randomness: Why Math.random() Is Never Enough
How CSPRNGs work, why PRNG output is predictable, and how browsers expose secure randomness via the Web Crypto API.
Published:
Tags: security, cryptography, randomness
Cryptographic Randomness: How Operating Systems Generate Entropy Your computer generates random numbers constantly — for encryption keys, session tokens, TLS handshakes, UUID generation, and password creation. But where does this randomness actually come from? A deterministic machine that does exactly what it's programmed to do cannot spontaneously generate true randomness. The answer involves hardware physics, OS-level entropy pools, and algorithms specifically designed to make even leaked state non-exploitable. True Randomness vs Computational Randomness True randomness requires a physical process with genuinely unpredictable outcomes: radioactive decay, photon behavior, thermal noise. These are available via hardware random number generators (HRNGs), but not every system has dedicated…
All articles · theproductguy.in