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In 1916, the USA bought the West Indian islands from Denmark. An encrypted telegram about this purchase, sent by the Danish ambassador, is available on a website.
Magnus Ekhall from Sweden has solved my Playfair challenge from September 2019. With only 28 letters, this ciphertext is the shortest of its kind ever broken.
Kryptos Workshop Transcript Richard Bean provided a transcription of the Kryptos workshop on 24 October 2015. THANK YOU VERY MUCH! 3:55 I look at cryptography as building things … there’s other aspects, and maybe from your perspective … in the sense of … if you had a cryptographic paradigm is there a way to break…
George Lasry has found an interesting collection of challenge ciphers, probably used to train codebreakers during the early Cold War. Today, I’m going to present one of these challenges.
Outsider artist James Hampton’s writing in an unknown script is one of the world’s most puzzling crypto mysteries. Today, I’m going to introduce an unencrypted text that can be read on Hampton’s only artwork. As far as I know, this note has never been published before.
A few weeks ago, I introduced a 1000-letter ciphertext created with a bigram substitution. Jarl Van Eycke and Louie Helm have now solved this challenge and set a new world record.
Blog reader Christof Rieber has sent me a potential solution of a major crypto mystery: the encrypted passages of Lady Gewndolen’s diary. Is Christof’s deciphering attempt correct?
At the hacker conference 44CON 2019, wich took place in September in London, I gave a talk about Cold War cryptography. Here’s a professionally produced video of it.
Blog reader Norbert Biermann has recently solved a bigram substitution ciphertext consisting of 1346 letters – the shortest one ever broken. Here’s a 1000-letter ciphertext of the same kind.
In 1873, an unknown person published two encrypted advertisements in the Daily Telegraph. Can a reader break these cryptograms?
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