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Information technology. Security techniques. Time-stamping services - Traceability of time sources Ingestion-build-52208 This International Standard specifies a1 Scope This part of ISO IEC 18014 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.