Suchergebnisse für „25“
Christopher Columbus frequently used a signature that included seven letters not belonging to his name. Do they represent an abbreviation?
Jarl Van Eycke and Louie Helm recently solved a bigram substitution ciphertext consisting of 1000 letters – the shortest one ever broken. Now I have created a 750-letter challenge of the same kind.
A video documentary presents new facts about the history of the Enigma in the 1930s and its deciphering in the Second World War.
A French expert team has succeeded in factorizing a 795 bit prime number product. This is a new world record. The old one (768 bit) dated from 2009.
A children’s book from the 1980s contains numerous encrypted and hidden messages. Can a reader solve four of these?
In 1891, an unknown person published an advertisement in the Morning Post. Five words in this message are encrypted. Can a reader break this cryptogram?
At the “Secret Communications 3” exhibition in Duivendrecht, NL, blog reader Karsten Hansky showed me a wired rotor similar to the ones used by the Enigma. It is probably of Russian origin. Does a reader know more about it?
Today I’m presenting a 26 letter message that has been encrypted with a Playfair cipher. To my knowledge, such a short Playfair cryptogram has never been solved before.
Crypto expert Frode Weierud has published a collection of unsolved cryptograms from 1969. If you’re looking for a challenging codebreaking project, here you go.
IT security experts have cracked a number of passwords used by Unix pioneers in the late 1970s.
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