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Which of the following is required for cryptanalysis?

Which of the following is required for cryptanalysis?

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A.
Access to plaintext

B.
Access to plaintext and ciphertext

C.
Access to algorithm source

D.
Access to ciphertext and algorithm source

Explanation:
Cryptanalysis is the process of trying to break a cryptosystem. This
usually means uncovering the key that was used for encryption. Cryptanalysis can be
performed by "white hats" to uncover flaws and weaknesses in a
cryptosystem or by "black hats" to gain unauthorized access to encrypted
data. The attacker must at least know the algorithm that was used and capture some
ciphertext to run brute-force attacks against.


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