Sincronização Segura de Relógio para Documentos Eletrônicos

Julio da Silva DiasRicardo Felipe CustódioDenise Bendo Demétrio

Trusted time sources are required to insert time stamps in electronic documents. A time stamped electronic document can be equiparated to tradicional paper document and has legal weight. Clock synchronization protocols of the sort provided by NTP do not satisfy all requirements to assure that a time source is trusted. This paper propose the use of external Certificate Authority (CA) issuing digital certificates to all computer systems that wants to synchronize its clock using NTPv4 protocol. It is also proposed the use of external auditors and a Time Stamp Authority (TSA) based on relative techniques to make this kind of service trustworthy. All modules inserted will not affect the normal operation of NTPv4 protocol.

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