An adversary is generally considered to be a person, group, or force that opposes and/or attacks. Adversary may also refer to: *

Satan Satan,, ; grc, ὁ σατανᾶς or , ; ar, شيطانالخَنَّاس , also known as Devil in Christianity, the Devil, and sometimes also called Lucifer in Christianity, is an non-physical entity, entity in the Abrahamic religions ...

("adversary" in Hebrew), in Judeo-Christian religion

Entertainment

Fiction

* Adversary (comics), villain from the Marvel comics universe * The mysterious antagonist who invaded the homelands in the comic book series '' Fables''

Music

* Ad·ver·sary, Canadian industrial musician

Law

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

Science

Adversarial collaboration In science, adversarial collaboration is a term used when two or more scientists with opposing views work together. This can take the form of a scientific experiment conducted by two groups of experimenters with competing hypotheses, with the aim ...

, a scientific experiment

Computer science

Adversary (cryptography) In cryptography, an adversary (rarely opponent, enemy) is a malicious entity whose aim is to prevent the users of the cryptosystem from achieving their goal (primarily privacy, integrity, and availability of data). An adversary's efforts might ta ...

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

Other

* Adversarial purchasing, in business strategic management