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Bit Length

Definitions:

  The number of bits in a bit string.
Sources:
NIST SP 800-38C

  A positive integer that expresses the number of bits in a bit string.
Sources:
NIST SP 800-56B Rev. 2 under Bit length

  The number of bits in a bit string (e.g., the bit length of the string 0110010101000011 is sixteen bits). The bit length of the empty (i.e., null) string is zero.
Sources:
NIST SP 800-56C Rev. 2 under Bit length