安全性分析表明该方案能够防止明文攻击、合谋攻击和伪造攻击。
The security analysis shows it can prevent plaintext attack, conspiracy attack and forging attack.
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.
提出了一种改进的安全信道建立算法，新的算法能够承受已知明文攻击，同时还提高了加、解密运算的效率。
A improved algorithm that builds security channel is provided, the new algorithm not only against known-plaintext attack, but also enhance efficiency of operation for encryption and decryption.
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.
以明文方式传输消息、传输加密的但以明文方式存储的消息、或者由于密钥被窃取或通过密码分析获取后对消息进行解密，在以上几种情况下都可能发生这种攻击。
This can happen to messages being transmitted in the clear, transmitted encrypted but stored in the clear, or decryption of messages due to stolen key or cryptoanalysis.
DBA或者高权限账号被攻击者获取后，虽然攻击者能够得到数据库中的全部数据，但是由于敏感数据是被加密的，所以仍然不能获得明文。
DBA or high privilege account was acquired by the attacker, although the attacker can get all the data in the database, but because the sensitive data is encrypted, it still can not get plaintext.
最后给出了对该类方案的已知明文的同态攻击方法，弥补了该类方案理论分析上的不足。
Homeostasis attack of this kind of scheme is also proposed with known plaintext, all of these could make up the shortcoming of theory analysis.
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.
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