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出典:Wiktionary
chosen-plaintext attack (複数形 chosen-plaintext attacks)
出典:Wikipedia
出典:『Wikipedia』 (2010/08/06 16:03 UTC 版)
A chosen-plaintext attack (CPA) is an attack model for cryptanalysis which presumes that the attacker has the capability to choose arbitrary plaintexts to be encrypted and obtain the corresponding ciphertexts. The goal of the attack is to gain some further information which reduces the security of the encryption scheme. In the worst case, a chosen-plaintext attack could reveal the scheme's secret key.