An attacker may obtain duplicate texts,one in ciphertext and one in plaintext,and thus reverse-engineer the encryption algorithm in a known-plaintext attack scheme._________________________

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In a known-plaintext attack scheme, an attacker has access to both plaintext and corresponding ciphertext. This type of attack can be used to analyze the encryption algorithm used and find vulnerabilities. Therefore, an attacker can obtain duplicate texts, one in ciphertext and one in plaintext, and reverse-engineer the encryption algorithm.

An Attacker May Obtain Duplicate Texts,one in Ciphertext and One