GB/T 31308.4-2023行政、商业和行业中的数据元、过程和文档长效签名第4部分:用于长效签名格式的存证对象属性国家标准
英文:Processes, data elements and documents in commerce, industry and administration—Long term signature—Part 4: Attribute...
英文:Processes, data elements and documents in commerce, industry and administration—Long term signature—Part 4: Attribute...