Study on the Security of Time-Stamping Service Architecture

NTSC and Uni-trust are constructing the public Time-Stamping service platform of China. In this paper, we present the architecture of Time-Stamping service and analyze the threats are encountered in each Time-Stamping system. Then we propose a modified architecture for overcoming these threats. This architecture is relies on a secure time service to obtain a authentic time stamp from the Time Authority, and makes the client obtain a trusted time from the TSA during the Time-Stamping service. This method improves the security of time service in Time-Stamping Service.