Participants of the International Students’ Olympiad in Cryptography have to solve a number of tough crypto challenges. Here are a few of the nicest ones. Can you solve them?
A German memorial coin minted in 2011 bears a hidden code. Maybe my readers can help me to find out more about it.
Earlier this year I blogged about Printer Identification Codes, which are one of the IT world’s best-kept secrets. As it seems, a US secret service has now used this technology to track down a whistleblower.
US mathematics professor Craig Bauer has published a great book about unsolved cryptograms. Most of these crypto mysteries have been covered on this blog before.
The Handycipher is an encryption algorithm that doesn’t require a computer program or a machine. But is it secure?
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