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What's a cipher text only cryptanalytic attack?
It's an attack when an attacker has the ciphertext of several messages encrypted with the same algorithm.
It's an attack when an attacker has plaintext and ciphertext. They then analyze the encryption of the plaintext to acquire the corresponding ciphertext.
It's an attack when an attacker has the plaintext and corresponding ciphertext of the same messages. They then need to find the key.
It's when an attacker examines the ciphertext pairs generated by the encryption of plaintext pairs and analyzes the differences.
It's an attack when an attacker has the cipher text of several messages encrypted with the same algorithm. They then need to find the key. It's the easiest and most common type of cryptanalytic attack.
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