传统的线性移位寄存器序列具有递推性，导致密文抗攻击能力不强。
A traditional linear feedback successive-displacement register (LFSR) random sequence has recurrence character generally, so it makes the ability of anti-attacking of encrypted files poor.
该方案被认为是抗适应性选择密文攻击的实用方案之一，但缺乏严格的安全性证明。
This scheme is regarded as one of practical schemes against adaptively chosen ciphertext attacks, but it is absent of rigorous proofs.
提出两个抗选择密文攻击的门限密码系统。
Two threshold cryptosystems secure against chosen ciphertext attacks are proposed.
抗选择密文攻击公钥密码体制是安全性很高的密码体制，它是设计抗主动攻击的协议非常有用的工具。
The public key cryptosystem secure against chosen ciphertext attacks is a very strong secure cryptosystem and is a useful primitive for designing protocols that resisting active adversary.
奉文重点讨论了渤海锥体与圆柱抗冰结构动冰力模型的进展，为定量计算结构疲劳寿命创造了条件。
Then the dynamic ice force researches on both vertical and conical structures in Liaodong Bay are presented, which form the foundation of quantitatively calculating the structural fatigue life.
详细阐述了其加密原理和密文索引结构，对重复性数据的加密处理和算法抗攻击性进行了分析。
The encryption principle and index structure of encryption data are developed. The encryption processing of duplicate data and algorithm exposure are analyzed.
详细阐述了其加密原理和密文索引结构，对重复性数据的加密处理和算法抗攻击性进行了分析。
The encryption principle and index structure of encryption data are developed. The encryption processing of duplicate data and algorithm exposure are analyzed.
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