Random bit

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Definitions:

A bit for which an attacker has exactly a 50% probability of success of guessing the value of the bit as either zero or one.
Sources:
NIST SP 800-106

A bit for which an attacker has exactly a 50% probability of success of guessing the value of the bit as either a zero or one. It is also called an unbiased bit.
Sources:
NIST SP 800-107 Rev. 1

Glossary Comments

Comments about specific definitions should be sent to the authors of the linked Source publication. For NIST publications, an email is usually found within the document.

Comments about the glossary's presentation and functionality should be sent to secglossary@nist.gov.

See NISTIR 7298 Rev. 3 for additional details.