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Password length parameter
In telecommunication, a password length parameter is a basic parameter affecting the password length needed to provide a given degree of security.
Note 1: Password length parameters are related by the expression P = LR /S , where P is the probability that a password can be guessed in its lifetime, L is the maximum lifetime a password can be used to log in[?] to a system, R is the number of guesses per unit of time, and S is the number of unique algorithm-generated passwords (the password space).
Note 2: The degree of password security is determined by the probability that a password can be guessed in its lifetime.
Source: from Federal Standard 1037C
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