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- Chosen-ciphertext_attack abstract "A chosen-ciphertext attack (CCA) is an attack model for cryptanalysis in which the cryptanalyst gathers information, at least in part, by choosing a ciphertext and obtaining its decryption under an unknown key. In the attack, an adversary has a chance to enter one or more known ciphertexts into the system and obtain the resulting plaintexts. From these pieces of information the adversary can attempt to recover the hidden secret key used for decryption.A number of otherwise secure schemes can be defeated under chosen-ciphertext attack. For example, the El Gamal cryptosystem is semantically secure under chosen-plaintext attack, but this semantic security can be trivially defeated under a chosen-ciphertext attack. Early versions of RSA padding used in the SSL protocol were vulnerable to a sophisticated adaptive chosen-ciphertext attack which revealed SSL session keys. Chosen-ciphertext attacks have implications for some self-synchronizing stream ciphers as well. Designers of tamper-resistant cryptographic smart cards must be particularly cognizant of these attacks, as these devices may be completely under the control of an adversary, who can issue a large number of chosen-ciphertexts in an attempt to recover the hidden secret key. For a while in the late 1970's and 1980's it was not clear at all that public key cryptosystems can withstand the chosen ciphertext attack, until the initial work of Moni Naor and Moti Yung in 1990.When a cryptosystem is vulnerable to chosen-ciphertext attack, implementers must be careful to avoid situations in which an adversary might be able to decrypt chosen-ciphertexts (i.e., avoid providing a decryption oracle). This can be more difficult than it appears, as even partially chosen ciphertexts can permit subtle attacks. Additionally, other issues exists and some cryptosystems (such as RSA) use the same mechanism to sign messages and to decrypt them. This permits attacks when hashing is not used on the message to be signed. A better approach is to use a cryptosystem which is provably secure under chosen-ciphertext attack, including (among others) RSA-OAEP secure under the random oracle heuristics, Cramer-Shoup and many forms of authenticated symmetric encryption when one uses symmetric encryption rather than public key cryptography.".
- Chosen-ciphertext_attack wikiPageID "103586".
- Chosen-ciphertext_attack wikiPageRevisionID "602592531".
- Chosen-ciphertext_attack hasPhotoCollection Chosen-ciphertext_attack.
- Chosen-ciphertext_attack subject Category:Cryptographic_attacks.
- Chosen-ciphertext_attack type Abstraction100002137.
- Chosen-ciphertext_attack type Act100030358.
- Chosen-ciphertext_attack type Activity100407535.
- Chosen-ciphertext_attack type Attack100972621.
- Chosen-ciphertext_attack type CryptographicAttacks.
- Chosen-ciphertext_attack type Event100029378.
- Chosen-ciphertext_attack type Operation100955060.
- Chosen-ciphertext_attack type PsychologicalFeature100023100.
- Chosen-ciphertext_attack type YagoPermanentlyLocatedEntity.
- Chosen-ciphertext_attack comment "A chosen-ciphertext attack (CCA) is an attack model for cryptanalysis in which the cryptanalyst gathers information, at least in part, by choosing a ciphertext and obtaining its decryption under an unknown key. In the attack, an adversary has a chance to enter one or more known ciphertexts into the system and obtain the resulting plaintexts.".
- Chosen-ciphertext_attack label "Atak z wybranym szyfrogramem".
- Chosen-ciphertext_attack label "Ataque de cifrotexto escolhido".
- Chosen-ciphertext_attack label "Attacco con testo cifrato scelto".
- Chosen-ciphertext_attack label "Chosen-ciphertext attack".
- Chosen-ciphertext_attack label "Атака на основе подобранного шифротекста".
- Chosen-ciphertext_attack label "选择密文攻击".
- Chosen-ciphertext_attack sameAs Attacco_con_testo_cifrato_scelto.
- Chosen-ciphertext_attack sameAs Atak_z_wybranym_szyfrogramem.
- Chosen-ciphertext_attack sameAs Ataque_de_cifrotexto_escolhido.
- Chosen-ciphertext_attack sameAs m.0q44w.
- Chosen-ciphertext_attack sameAs Q2420767.
- Chosen-ciphertext_attack sameAs Q2420767.
- Chosen-ciphertext_attack sameAs Chosen-ciphertext_attack.
- Chosen-ciphertext_attack wasDerivedFrom Chosen-ciphertext_attack?oldid=602592531.
- Chosen-ciphertext_attack isPrimaryTopicOf Chosen-ciphertext_attack.