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A finite, ordered sequence of bytes.
NIST SP 800-38D
An ordered sequence of bytes.
NIST SP 800-56B Rev. 2 under Byte string
An ordered sequence of bytes, beginning with the most significant (leftmost) byte and ending with the least significant (rightmost) byte. Any bit string whose bit length is a multiple of eight can be viewed as the concatenation of an ordered sequence of bytes (i.e., a byte string). For example, the bit string 0110010101000011 can be viewed as a byte string since it is the concatenation of two bytes: 01100101 followed by 01000011.
NIST SP 800-56C Rev. 2 under Byte string