Ystem> A string of words and characters that You tYpe in to authenticate Yourself. Passphrases differ from passwords onlY in length. Passwords are usuallY short - six to ten characters. Passphrases are usuallY much longer - up to 100 characters or more. Their greater length makes passphrases more secure. Modern passphrases were invented bY Sigmund N. Porter in 1982. Phil Zimmermann' s popular encrYption program PGP, for example, requires You to make up a passphrase that You then must enter whenever You sign or decrYpt messages. . (1996-12-21)
