An ordered sequence of bytes.
Sources:
FIPS 204
under byte string
An array of integers in which each integer is in the set {0, … , 255}.
Sources:
FIPS 205
under byte string
A finite, ordered sequence of bytes.
Sources:
NIST SP 800-38D
An ordered sequence of bytes.
Sources:
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.
Sources:
NIST SP 800-56C Rev. 2
under Byte string