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Cryptographic Keys and Decks of Cards

88 · John Cook · July 28, 2026, 12:21 p.m.
Math Combinatorics Cryptography Cryptography data storage mathematics digital security
Summary
The blog discusses the concept of storing cryptographic keys using the order of a deck of cards, explaining how 52 cards can hold 225 bits of data due to the mathematical representation of permutations. It hints at the need for larger key storage solutions in cryptography.
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