Ver:
Método
criptoanalítico en el cual el atacante
puede obtener el texto en claro correspondiente a cualquier texto cifrado por
él elegido. [Ribagorda:1997]
(I) A
cryptanalysis technique in which the analyst tries to determine the key from
knowledge of plain text that corresponds to cipher text selected (i.e.,
dictated) by the analyst. [RFC4949:2007]
A
chosen-ciphertext attack (CCA) is an attack model for cryptanalysis in which
the cryptanalyst chooses a ciphertext and causes it to be decrypted with an
unknown key. Specific forms of this attack are sometimes termed
"lunchtime" or "midnight" attacks, referring to a scenario
in which an attacker gains access to an unattended decryption machine. A device
which provides decryptions of chosen ciphertexts (either by accident or by
design) is generically referred to as a "decryption oracle".
http://en.wikipedia.org/wiki/Chosen_ciphertext_attack
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