In the system of Electric-Government, transmission of documents, storage of data, supplying service and so on, are applied in the electronic form. For the reason, it has been proposed that transacting without paper in government and enterprise.

• 电子政务系统中,政府机关的公文往来、资料存储、服务提供都以电子化的形式来实现,这就使政府和企业的无纸化办公已提上了日程,如何保障公文的合法性、唯一性、可追溯性、防非法复制、防非法窜改等成为有待解决的问题。