选择密文攻击(chosen ciphertext ) 选择明文-密文对攻击(chosen plaintext-ciphertext ) 无条件安全(unconditional security) ..
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选择明文攻击 Chosen-plaintext attack ; chosen plaintext
选择明文-密文对攻击 chosen plaintext-ciphertext
自适应选择明文攻击 adaptive-chosen-plaintext 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.
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