Browser-based demo of differential cryptanalysis — the attack co-invented by Eli Biham and Adi Shamir (Israel, 1990) that broke DES. Live attack on a toy SPN cipher, DDT visualization, and the story of how Biham used his own attack to design Serpent.

Browser-based demo of Shamir's Secret Sharing — split a secret into n shares, reconstruct from any k. Polynomial curve visualization, information-theoretic security proof, and AES key protection. Invented by Adi Shamir (Weizmann Institute, Israel) in 1979.