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Random bit

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