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?
Designing a secure and convenient encryption algorithm that doesn’t require a computer program or a machine is quite a challenge. The Handycipher is an interesting method of this kind.
Crypto history expert Frode Weierud has found a number of encrypted messages in an archive. Can we help him to decipher these cryptograms?
Tissie and Jabber as well as Harry and Caroline were two amorous couples, who exchanged encrypted messages via newspaper ads more than a century ago. Their encryption codes are unsolved to date.
Last week I presented the mystery of an encrypted note found in an antique silk dress. Has the codebook used now been found?
A young man, who had disappeared from his home in California, sent an encrypted message from Israel to his parents. This cryptogram has been unsolved for over four decades. Can a reader decipher it?
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