# TIA's Glossary of Telecommunication Terms

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## password length equation

An equation that determines an appropriate password length, *M* , which provides an acceptable probability, *P* , that a password will be guessed in its lifetime. *Note:* The password length is given by *M* = (log *S* )/(log *N* ) where *S* is the size of the password space and *N* is the number of characters available. The password space is given by *S* = *LR* /*P* , where *L* is the maximum lifetime of a password and *R* is the number of guesses per unit of time.

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