The Copiale cipher is an 105-page coded document found in an East German archive, and dated to 1866 - but the code used to shield its mysteries has remained unbroken, until now. The international team ...

The Zodiac’s code was a homophonic substitution cipher, where large areas of text was replaced with symbols. Dr Blake added that the Zodiac Killer made it even harder to solve by not writing the ...

Introduction to ciphers and substitution. Alice and Bob and Carl and Julius: terminology and Caesar Cipher ; The key to the matter: generalizing the Caesar Cipher ; Multiplicative ciphers ; Affine ...

History is full of coded mysteries, many of which can't be solved through decryption. (Representational) More than 400 years ago, Mary, Queen of Scots, was imprisoned in an English castle on charges ...