Ng system> 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)
