以下为句子列表：
英文: In security, as nearly every plaintext data block is encrypted with different keys, and as most attacking techniques have high demands of plaintext/ciphertext pairs, it is difficult for them to work in such a cipher scheme.
中文: 在安全方面，由于加密时所有明文组几乎都各自使用了不同的轮密钥，而绝大数攻击方法需要一定数量相同密钥加密的明密文对，从而使这些攻击方法不能奏效。
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英文: The method in question is a ciphertext-only attack. This means that we don't need bits of guessed/known plaintext for a successful decryption.
中文: 解决问题的方法是对纯密码信息进行攻击。这意味着我们不需要猜解或在已知明码文本的某些比特位信息的情况下来对密文进行完美解密。
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