Pack Your Knapsack For Some Secret Messages — Difficult to Pack/Easy to Unpack

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RSA is just one way of doing public key encryption. Knapsack is a good alternative where we can create a public key and a private one:

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Prof Bill Buchanan OBE FRSE
ASecuritySite: When Bob Met Alice

Professor of Cryptography. Serial innovator. Believer in fairness, justice & freedom. Based in Edinburgh. Old World Breaker. New World Creator. Building trust.