In which of the following cryptographic attacking techniques does an attacker obtain encrypted messages that have been encrypted using the same encryption algorithm?
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A. B. C. D.C.
In a ciphertext only attack, an attacker obtains encrypted messages that have been encrypted using the same encryption algorithm.
The correct answer to this question is B. Chosen ciphertext attack.
A chosen ciphertext attack is a type of cryptanalysis attack in which an attacker gains access to encrypted messages and is able to use them to obtain the encryption key. This type of attack assumes that the attacker has access to the ciphertexts of multiple plaintexts encrypted using the same encryption algorithm. By observing the resulting ciphertexts, the attacker can then derive the encryption key used by the algorithm.
In a chosen ciphertext attack, the attacker can choose the ciphertexts they want to decrypt and submit them to the encryption algorithm to observe the resulting plaintexts. This allows the attacker to gain information about the encryption key being used by the algorithm, which they can then use to decrypt other ciphertexts encrypted using the same key.
Chosen ciphertext attacks are a serious threat to cryptographic systems, as they can compromise the security of the system by revealing sensitive information. To prevent chosen ciphertext attacks, it is important to use strong encryption algorithms and to implement proper key management procedures to prevent the leakage of encryption keys.