Early 1970s - Unix: too fast and not salted

The problems were understood before 7th Edition (1978)

"The running time to encrypt one trial password and check the result turned out to be approximately 1.25 milliseconds on a PDP-11/70 when the encryption algorithm was recoded for maximum speed."
"It takes essentially no more time to test the encrypted trial password against all the passwords in an entire password file, or for that matter, against any collection of encrypted passwords, perhaps collected from many installations."
Robert Morris and Ken Thompson, "Password Security: A Case History", 1978