BS ISO/IEC 18014-4:2015

Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
5 General
6 Time traceability chains and certification of traceability
7 Technical requirements for TAA
Annex A (informative) - Relation between time offset
        certificate and existing national standards
Annex B (informative) - Traceability chains and
        required accuracy
Annex C (informative) - Examples of TAA-based trusted
        time source schemes from ITU-R TF.1876
Annex D (informative) - Required accuracy and frequency
        stability of the reference clock
Bibliography

Defines an overall architecture for providing the time to the time-stamping authority (TSA) and to guarantee the correctness of it through the use of the TAA.

This part of ISO/IEC18014

• defines the functionality of the time assessment authority (TAA),

• describes an overall architecture for providing the time to the time-stamping authority (TSA) and to guarantee the correctness of it through the use of the TAA, and

• gives technical guidelines for the TAA to provide, and to provide assurance in, a trusted time source to the TSA.