A single leaked hint exposed the CIA’s most puzzling code. But dozens of the world’s toughest ciphers are still waiting to be ...

A coded passage in “Kryptos,” Jim Sanborn’s sculpture at CIA headquarters, has gone unsolved for decades. After he announced its auction, two researchers stumbled on the answer.

They have precise rules based on their physical, chemical, and biological properties that encode cell behavior,” Szleifer said. The study suggests that the geometric code may have been a key ...