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See Chinese contents: GM/T 0033-2014 GM/T 0033-2014: Interface specifications of time stamp
This Standard specifies the time stamp service interface for application systems and time stamp authority systems, including the format of the time stamp requests and response messages, transmission mode, and time stamp service interface function. This Standard is applicable to the specifications of the products related to time stamp service based on the public key cryptographic infrastructure application technology framework as well as the integration and application of time stamp services.
