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TMacTagBits(X)

Definition(s):

  A truncation function that outputs the most significant (i.e., leftmost) MacTagBits bits of the input string, X, when the bit length of X is greater than MacTagBits; otherwise, the function outputs X. For example, T2(1011) = 10, T3(1011) = 101, and T4(1011) = 1011.
Source(s):
NIST SP 800-56B Rev. 2

  A truncation function that outputs the most significant (i.e., leftmost) MacTagBits bits of the input string, X, when the bit length of X is greater than MacTagBits; otherwise, the function outputs X. For example, T2(1011)=10, T3(1011)=101, and T4(1011)=1011.
Source(s):
NIST SP 800-56B Rev. 1 [Superseded]