Entropy

nounverified·updated May 9, 2026

A measure of the amount of uncertainty that an Attacker faces to determine the value of a secret. Entropy is usually stated in bits.

Framework senses

4 senses across 3 frameworks

NISTIR 7298: Glossary of Key Information Security Terms, Revision 21 senseview framework →

§1: A measure of the amount of uncertainty that an Attacker faces to determine the value of a secret. Entropy is usually stated in bits.

NIST SP 800-631 senseview framework →

§1: A measure of the amount of uncertainty that an Attacker faces to determine the value of a secret. Entropy is usually stated in bits.

Wordset Dictionary2 sensesview framework →

§1: (thermodynamics) a thermodynamic quantity representing the amount of energy in a system that is no longer available for doing mechanical work
§2: (communication theory) a numerical measure of the uncertainty of an outcome