| 专利名称 | METHOD AND DEVICE FOR IMPLEMENTING STREAM CIPHER | 申请号 | EP20090845692 | 专利类型 | EP | 公开（公告）号 | EP2442482(B1) | 公开（授权）日 | 2016.09.14 | 申请（专利权）人 | 中国科学院信息工程研究所 | 发明（设计）人 | FENG, DENGGUO;JIN, CHENHUI;QI, WENFENG;WU, WENLING;WANG, KUNPENG;GUAN, JIE;ZHU, XUANYONG;ZHANG, YIWEI;HU, YUPU;ZHANG, BIN;ZHANG, WENZHENG;FENG, XIUTAO;QIAN, LISONG;ZHANG, WENTAO;SUN, ZHONGHUA | 主分类号 | H04L9/22 | IPC主分类号 | H04L9/22 | 专利有效期 | METHOD AND DEVICE FOR IMPLEMENTING STREAM CIPHER 至METHOD AND DEVICE FOR IMPLEMENTING STREAM CIPHER | 法律状态 | 说明书摘要 | The present invention discloses a method and a device for implementing stream cipher. The method includes: implementing a key expansion operation with a pre-set 128-bit initial key and 128-bit initial vector, to obtain 16 31-bit state variables; implementing N-round operations using the state variables, wherein N is a positive integer and in turn each round of operation includes: bit restructuring, nonlinear state filtering operation and variable initialization mode operation; processing the output results after the N-round operations in turn using bit restructuring, nonlinear state filtering operation and discarding the output, as well as the variable work mode operation; implementing the following steps in each clock tick and respectively in turn: bit restructuring, nonlinear state filtering operation, XOR operation, and variable work mode operations, to obtain 32-bit pseudo-random sequence. Application of the method and device described in this invention can be simple and convenient way to obtain the required pseudo-random sequence, and has a high security. |
1、源头对接，价格透明
2、平台验证，实名审核
3、合同监控，代办手续
4、专员跟进，交易保障