US crypto expert Jim Gillogly broke over 1,000 transposition cryptograms created by IRA activists in the 1920s. Only one of these messages remained unsolved. Now, it has been broken by Richard Bean from Brisbane, Australia.
In 1897, an unknown person published an encrypted advertisement in the Daily Telegraph. The only two words left in the clear are JIM LOCKET. Can a reader break this cryptogram?
René Zandbergen is in my view the world’s leading Voynich manuscript expert. A talk he gave at HistoCrypt 2019 and his website provide interesting pieces of information.
British author Lady Gwendolen Gascoyne-Cecil encrypted a passage in her diary. This cryptogram has never been solved.