U.S. flag   An official website of the United States government
Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock (Dot gov) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

Computer Security Resource Center

Computer Security Resource Center

    Glossary
A  |  B  |  C  |  D  |  E  |  F  |  G  |  H  |  I  |  J  |  K  |  L  |  M  |  N  |  O  |  P  |  Q  |  R  |  S  |  T  |  U  |  V  |  W  |  X  |  Y  |  Z

x -1 mod n

Definition(s):

  The multiplicative inverse of the integer x modulo the positive integer n. This quantity is defined if and only if x is relatively prime to n. For the purposes of this Recommendation, y = x-1 mod n is the unique integer satisfying the following two conditions:
Source(s):
NIST SP 800-56B Rev. 2

  The multiplicative inverse of the integer x modulo the positive integer n. This quantity is defined if and only if x is relatively prime to n. For the purposes of this Recommendation, y = x-1 mod n is the unique integer satisfying the following two conditions: 1) 0 £ y < n, and 2) 1 = (xy) mod n.
Source(s):
NIST SP 800-56B Rev. 1 [Superseded]