# TIA's Glossary of Telecommunication Terms

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## password length parameter

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.

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