Treat your password like your toothbrush. Don’t let anybody else use it, and get a new one every six months.

About Clifford Stoll

Clifford Paul “Cliff” Stollis an American astronomer, author and teacher.
He is best known for his investigation in 1986, while working as a system administrator at the Lawrence Berkeley National Laboratory, that led to the capture of hacker Markus Hess, and for Stoll’s subsequent book The Cuckoo’s Egg, in which he details the investigation.

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