SAN FRANCISCO (KRON/AP) – A coded letter mailed to a San Francisco newspaper by the Zodiac Killer in 1969 has been deciphered by a team of amateur sleuths from the United States, Australia, and ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. MYSTERY WIRE — The United States Federal ...

Sam Blake, an Australian mathematician, first learned of the Zodiac Killer’s unsolved ciphers — a series of encrypted messages — from a documentary in the 1990s. His interest marginally increased in ...

You could do worse than to confuse the meanings of "code" and "cipher"—even cryptographers sometime use the terms as though they had the same meaning. There is, however, a definite distinction between ...

Until now, a 250-year-old encoded text titled the Copiale Cipher baffled cryptographers and historians with bizarre symbols and seemingly random letters. Computer scientist Kevin Knight and two ...

For more than 200 years, buried deep within Thomas Jefferson's correspondence and papers, there lay a mysterious cipher -- a coded message that appears to have remained unsolved. Until now. The ...

How does a cipher and code, used by a failed politician, dropped into the middle of a trial for treason in 1807, involving then-president Thomas Jefferson and Chief Justice John Marshall, lead to a ...