Home / Standards / GB/T 20520-2025 GB/T 20520-2025 Active Cybersecurity technology—Public key infrastructure—Specification for time stamp 网络安全技术 公钥基础设施 时间戳规范 Standard Type GBT ICS 35.030 CCS L80 Status 现行 Issue Date 2025-08-01 Implementation 2026-02-01 Responsible Dept 国家标准委 Drafting Unit N/A