A secret code letter sent in 1812 by Napoleon Bonaparte boasting that his French forces would blow up Moscow's Kremlin has sold at auction for ten times its estimated presale price.

Sub Lieut. John Pryor's letters -- which touch on topics like gardening and vegetable patches -- contained messages for the British military and a secret code that died with him.

Some of the very first secret codes were substitution ciphers--schemes for transforming the letters in a message to render them unreadable to anybody who didn't know the secret to decoding them.

In one of Warren G. Harding’s torrid love letters to his mistress Carrie Fulton Phillips, sent during the 1910s and ’20s, the future US president enclosed a long list of code words that the ...

"This letter is unique. Not only is it all in code, but it's the first time we see this different Napoleon. He went into Moscow in 1812 at the height of his power.

French scientists have decoded a letter written in 1547 by the Holy Roman Emperor Charles V. The three-page letter uncovers secrets of the 16th century, including assassination fears.

Modern-day code breakers read between the lines of naval officer's old family letters to reveal secret messages.

“Changing any letter, punctuation mark, or symbol into a slightly different form allows you to change the meaning of the document,” Chang Xiao, the paper’s lead author, said in a news release. “This ...

Inmates at Fulton County Jail in Atlanta go to extreme lengths to coordinate crimes with people on the outside. Last year, jail staff intercepted a letter written in secret code orchestrating the ...

Researchers have used state-of-the-art machine translation software — and some old-fashioned hunches — to crack the code used by a secret society in Germany three centuries ago.