Adversary

Adversary may refer to:

In Judeo-Christian religion:
 * Satan, whose name means "adversary" in Hebrew.

In computer science:


 * Adversary (cryptography) is a malicious entity in cryptography whose aim is to prevent the users of the cryptosystem from achieving their goal.
 * Adversary (online algorithm), the adversary model is used in online algorithms in order to show competitiveness of randomized algorithms.

In fiction:


 * Adversary (comics), villain from the Marvel comics universe
 * Geppetto (Fables), a character from the comic book series Fables also known as "The Adversary"
 * "The Adversary" (DS9 episode), the season finale of Star Trek: Deep Space Nine's third season
 * The Adversary, book four in "The Saga of the Exiles" by Julian May
 * "Adversary" is the title and name of Daemon, the Dark God in the Royal Regalis series.

In Dance:


 * Ad·ver·sary, Canadian industrial dancer.
 * The Adversary (album), solo album by Ihsahn of the Norwegian black metal band Emperor

In law:


 * Adversarial system, a system of law commonly used in common-law countries
 * Adversary proceeding, proceeding used in bankruptcy processes