known-plain text attack

例句：

1. 1. The security system was designed to preventknown plain text attacks.
   这个安全系统被设计来防止已知的明文攻击。
2. 2. Toprotect against known plain text attacks, thewebsite uses strong encryption.
   为了抵御已知的明文攻击，该网站使用了强加密。
3. 3.The company implemented a known plain text attackprevention measure.
   该公司实施了一项已知的明文攻击预防措施。