From Daily Mail Online comes this mystery from 1676:
A 17th century 'letter from the devil' written by a Sicilian nun who claimed to be possessed by Lucifer, has finally been translated thanks to the dark web.
The coded letter was written by Maria Crocifissa della Concezione at the Palma di Montechiaro convent in 1676, and she claimed it had been scribed by Satan using her hands.
Some 340 years later, a group of Italian computer scientists unscrambled the code using decryption software they found on the dark web, and found it does carry a devilish message - describing God and Jesus as 'dead weights'.
Sister Maria Crocifissa della Concezione was born Isabella Tomasi in 1645, but was rechristened once she entered the Benedictine convent at Palma di Montechiaro aged 15.