The mathematics that secures the digital world — modular clocks, primes and elliptic curves — taught to be seen, not memorised. Free and open, forever.
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The shape of a secret
Thousands of points on a perfect sphere — a picture of the vast key-space that hides every secret. Drift your cursor across it and watch the field bend away.
From modular arithmetic to post-quantum lattices, every lesson stays faithful to the standard references — Katz & Lindell, the NIST PQC standards — but is rebuilt to be felt, not just read. Faithful math, made visible.
Six sequenced stages carry you from clock arithmetic to the quantum horizon, each building on the last. Your progress saves as you go, so the road always picks up exactly where you left it.
The one-way door
Multiply two primes and you have a padlock anyone can shut. Reverse it — factor the product back — and the universe runs out of time first. That asymmetry is the whole game.
Modular arithmetic, primes & RSA, elliptic curves and post-quantum cryptography — explored with live calculators and step-by-step reveals until each idea clicks.
Crack the daily cipher, race ranked duels, collect the Legends of Crypto and beat the Vault bosses — real cryptographic math, turned into a game you'll want to keep playing.