【摘要】 电子文档容易被窜改,并且难以检测,为了证明该文档产生的时间,由时间戳机构加上时间戳。介绍了目前主要的四个时间戳协议,并分析了它们各自的优缺点,提出它们适用的条件。更多还原

【Abstract】 Electronic documents are easily tampered and difficult to detect.In order to prove the time when these documents are produced,time- stamping authority makes a time- stamp on them.Introduces four time- stamping protocols and analyses their shortcoming and strengths.It also points out the conditions that these protocols apply.更多还原