Electronic Signatures and Infrastructures (ESI) - Policy and Security Requirements for Trust Service Providers issuing Time-Stamps (Endorsement of the English version EN 319 421 V1.1. (2016-03) as German standard)
电子签名和基础设施(ESI).发行时间戳的信托服务提供商的政策和安全要求(作为德国标准认可英文版EN 319 421 V1.1.(2016-03)