Coin Flip & Dice Roller

Random number generators: from board games to cryptography

Random number generation powers everything from board game dice rolls to cryptography. Real randomness is harder than it seems. Pseudorandom numbers are generated by algorithms — fast and good enough for games, simulations, and most apps, but predictable if you know the seed. True random numbers come from physical processes (radioactive decay, atmospheric noise, quantum effects) and are unpredictable — required for cryptography and security.

Dice probability basics

A standard 6-sided die has a 1/6 (16.67%) chance of any given face. With two dice, the most common roll is 7 (six combinations), and the rarest rolls are 2 and 12 (one combination each). Three dice most commonly roll 10 or 11 (27 combinations each). This bell curve is why board games with multiple dice tend to have balanced outcomes. For board games, our random number generator is perfect. For gambling or cryptography, use specialized hardware random number generators.

Common uses

Settling disputes, choosing winners in giveaways, generating session IDs, picking random samples for surveys, shuffling playlists, board game dice substitutes, picking lottery numbers (with appropriate skepticism — true randomness still means low probability), generating test data, prototyping probability simulations. For anything involving money or security, use a cryptographically secure RNG.