# Random Number

Random Number definition in **Computer Security** terms:

Acronym(s): *None*

Definition(s): A value in a set of numbers that has an equal probability of being selected from the total population of possibilities and, in that sense, is unpredictable. A random number is an instance of an unbiased random variable, that is, the output produced by a uniformly distributed random process. Random numbers may, e.g., be obtained by converting suitable stings of random bits (see NIST SP 800-90A, Appendix B.5 for details).

**Source(s):** NIST SP 800-107 (Superceded by Rev. 1)

For the purposes of this Recommendation, a value in a set that has an equal probability of being selected from the total population of possibilities and, hence, is unpredictable. A random number is an instance of an unbiased random variable, that is, the output produced by a uniformly distributed random process.

**Source(s):** NIST SP 800-90A Rev. 1

Synonym(s): *None*

reference: CSRC Glossary

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