指出了这两种密码系统存在的缺陷，并且成功地实施了选择明文攻击。
The drawbacks of the two chaotic cryptosystems are pointed out respectively, and chosen plaintext attacks are carried out successfully.
但仍存在一些隐患，例如：重放攻击、密码猜测、会话中选择明文攻击等等。
But it still has some security hidden troubles, for instance: replay attack, password guessing, inter-session chosen plaintext attacks.
该文提出一个高效的全序有向传递签名方案，并证明该方案在选择明文攻击下是安全的。
In this paper, an efficient total ordering directed transitive signature scheme is proposed and its security against adaptive chosen-message attack is proved.
分析表明，该文所设计的加密算法不但能抵抗唯密文攻击，而且能有效地抵抗选择明文攻击。
The analysis indicates that the encryption algorithm not only can effectively resist cipher-text-only attack but also chosen-plaintext attack.
理论分析和仿真实验表明，本文提出的算法具有较高的安全性能，特别是在统计攻击、差分攻击和选择明文攻击能力方面具有很好的抗攻击性能。
Theoretical analysis and simulated experiment show that, the scheme has excellent performances against attacks, in particular statistical attack, differential attack and chosen plain image attack.
如果攻击者不能彼此区分两个加密，即使攻击者知道(或已经选择)相应的明文，则密码系统被称为语义安全。
A cryptosystem is called semantically secure if an attacker cannot distinguish two encryptions from each other even if the attacker knows (or has chosen) the corresponding plaintexts.
如果攻击者不能彼此区分两个加密，即使攻击者知道(或已经选择)相应的明文，则密码系统被称为语义安全。
A cryptosystem is called semantically secure if an attacker cannot distinguish two encryptions from each other even if the attacker knows (or has chosen) the corresponding plaintexts.
应用推荐