chosen-ciphertext attack

noun

An attack on a cryptosystem that relies on the attacker's ability to choose any ciphertext of their liking and decrypt it into the corresponding plaintext with that system and key. More powerful than a chosen-plaintext attack.

“The ElGamal encryption system is resistant against chosen-plaintext attacks, but not against chosen-ciphertext attacks.”

Similar
CCA
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Meanings

nounchosen-ciphertext attack (plural chosen-ciphertext attacks)

plural chosen-ciphertext attacks

  1. computingAn attack on a cryptosystem that relies on the attacker's ability to choose any ciphertext of their liking and decrypt it into the corresponding plaintext with that system and key. More powerful than a chosen-plaintext attack.

    The ElGamal encryption system is resistant against chosen-plaintext attacks, but not against chosen-ciphertext attacks.

    Synonyms: CCA

Synonyms & antonyms

nounAn attack on a cryptosystem that relies on the attacker's ability to choose any ciphertext of their liking and decrypt it into the corresponding plaintext with that system and key. More powerful than a chosen-plaintext attack.

Similar
CCA

Translations

Finnish valittuun salatekstiin perustuva hyökkäys
  • valittuun salatekstiin perustuva hyökkäyscryptanalytic attack
Cite this entry
APA

chosen-ciphertext attack. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/chosen-ciphertext%20attack

MLA

“chosen-ciphertext attack.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/chosen-ciphertext%20attack. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “chosen-ciphertext attack,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/chosen-ciphertext%20attack.

Source: chosen-ciphertext attack on Wiktionary, CC BY-SA 4.0.