Home / Standards / GB/T 20520-2006 GB/T 20520-2006 Abolished Information security technology - Public key infrastructure - Time stamp specification 信息安全技术 公钥基础设施 时间戳规范 Standard Type GBT ICS 35.040 CCS L80 Status 废止 Issue Date 2006-08-30 Implementation 2007-02-01 Responsible Dept 国家标准委 Drafting Unit N/A