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    • 3. 发明申请
    • IMPROVED CIPHER SYSTEM
    • 改进的CIPHER系统
    • WO2006111950A3
    • 2009-04-30
    • PCT/IL2006000312
    • 2006-03-09
    • NDS LTDMANTIN ITSIKSELLA YARONWAISBARD EREZ
    • MANTIN ITSIKSELLA YARONWAISBARD EREZ
    • H04L9/00G06F21/72G06F21/74
    • G06F21/74G06F21/72G06F2221/2105H04L9/0662
    • A system including a pseudo-random number generator (12) having a register to store an extended state having a reduced state and a dynamic constant, an initialization module to initialize a part of the extended state based on a Key (14) and/or an Initial Value (16), a state update module to update the reduced state, an output word module to generate output words, the state update module and the output word module being adapted to operate through cyclical rounds, each round including updating the reduced state and then generating one of the output words, and an update dynamic constant module to update the dynamic constant, wherein in a majority of the rounds, updating of the reduced state and/or generation of the output word is based on the dynamic constant, and the dynamic constant is only updated in a minority of the rounds. Related apparatus and method are also described.
    • 一种包括伪随机数发生器(12)的系统,具有用于存储具有减小状态和动态常数的扩展状态的寄存器,用于基于密钥(14)初始化部分扩展状态的初始化模块和/或 初始值(16),更新缩减状态的状态更新模块,用于生成输出字的输出字模块,状态更新模块和输出字模块适于通过周期性循环进行操作,每轮包括更新缩减状态 然后生成一个输出字,以及更新动态常量模块来更新动态常数,其中在大部分回合中,减小状态的更新和/或输出字的生成基于动态常数,以及 动态常数仅在少数几轮中更新。 还描述了相关装置和方法。