JSSemeone / Ludus Lab

Move the mouse and watch your movement turn into the bits of a random key.

Step through every round of a tiny Feistel cipher, flip bits and watch them spread.

Turn a message into bits, XOR it with a random key, and see why the key must never be reused.

Put the alphabet into a grid and turn every letter into a pair of numbers.

Encrypt with a keyword through the Vigenère table, the cipher once called unbreakable.

Turn the disk, encrypt a message letter by letter, send it to Bob and turn it back.

Entangled photon pairs, a Bell test played as a guessing game, and a shared secret key.

Walk Alice and Bob through all four stages of BB84 and catch Eve by the error rate.