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The cryptanalyst chooses plaintext to be encrypted. After analyzing the resulting cipher text, he chooses another sample to be encrypted. This is called a:
Adaptive Chosen Ciphertext Attack (ACCA)
Chosen Ciphertext Attack (CCA)
Adaptive Chosen Plaintext Attack (ACPA)
Chosen Plaintext Attack (CPA)
Adaptive chosen-plaintext and adaptive chosen-cipher text mean that the attacker can carry out one of these attacks and, depend on upon what the attacker gleaned from that first attack, modify her next attack. This is the process of reverse-engineering or cryptanalysis attacks: using what you learned to improve your next attack.
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