Edu
Cryptography, part 2: steganography
An encrypted message gets noticed. A well-hidden one does not. Steganography through a story from Herodotus: a slave, a shaved head and a revolt.
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Tag: cryptography
Edu
Cryptography, part 1: from secret art to Caesar's cipher
Before it was mathematics, cryptography was an art for initiates. Start with Caesar and ROT13, with three puzzles to solve with pen and paper.