首先阐述了电子商务的四个主要的安全需求，并就信息加密、数字签名、数字证书等信息安全技术的特点及其应用作了探讨。
First, This paper discusses four E-business's demands for safety, then introduces technology of information security and how they meet demands of secure electronic transactions.
签名过程分为四个阶段：系统初始化、生成个体签名、生成群签名以及签名验证。
The signature process included four phases: system initialization, individual signature generation, group signature generation and signature verification.
本系列同时收录了四个由他创作的夏洛克·福尔摩斯探案的故事——《蓝色宝 石》、《绿玉王冠》、《诺伍德谜案》和《四签名》。
His story about the detective Sherlock Holmes - The Blue Diamond, The Emerald Crown, The Norwood Mystery and The Sign of Four are also available in the Bookworms series.
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