Cliff Stoll, who traced the Cuckoo's Egg intrusion

1986

Cliff Stoll, the Berkeley astronomer who chased a 75-cent accounting discrepancy in 1986 and uncovered a KGB-paid West German intruder inside US military networks. His account, The Cuckoo's Egg, is the first real-time narrative of a computer intrusion investigation. Photographed at a security conference in 2017. The subject dates from 1986; the photograph itself is later.