# Exclusive-OR

Exclusive-OR definition in **Computer Security** terms:

Acronym(s): XOR

Definition(s): The bit-by-bit modulo 2 addition of binary vectors of equal length.

**Source(s):** NIST SP 800-20

NIST SP 800-67 Rev. 1

A mathematical operation; the symbol ?, defined as:

0 ? 0 = 0 1 ? 0 = 1

0 ? 1 = 1 1 ? 1 = 0

Equivalent to binary addition without carry.

**Source(s):** NIST SP 800-90A Rev. 1

The bitwise addition, modulo 2, of two bit strings of equal length.

**Source(s):** NIST SP 800-38A

NIST SP 800-38B

NIST SP 800-38C

NIST SP 800-38D

NIST SP 800-38F

Synonym(s): Exclusive-OR

The bit-by-bit modulo 2 addition of binary vectors of equal length.

**Source(s):** NIST SP 800-20 NIST SP 800-67 Rev. 1 A mathematical operation; the symbol ?, defined as:

0 ? 0 = 0 1 ? 0 = 1

0 ? 1 = 1 1 ? 1 = 0

Equivalent to binary addition without carry.

**Source(s):** NIST SP 800-90A Rev. 1 The bitwise addition, modulo 2, of two bit strings of equal length.

**Source(s):** NIST SP 800-38A NIST SP 800-38B NIST SP 800-38C NIST SP 800-38D NIST SP 800-38F

reference: CSRC Glossary

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