Photo by Tina Vanhove on Unsplash

How Can I Send You A Christmas Present, But For You Not To Cheat and Open It? … Time-lock Puzzles and Proof of Work

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So how might we make sure that someone does not open their present until Christmas Day? Well, one way is to get them to do some work to open it, and that we know it will only be done within a certain amount of time — such as with the days there are until Christmas. So, let’s look at an area…

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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.