Time Stamping

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The time stamping is the perfect complement to the security provided by digital identity certificates. By applying time stamping, it is guaranteed the exact moment at which the signing of a document is produced. The AC Camerfirma Time Stamping Service is based on standard specification RCF 3161– Internet X. 509 Public Key Infrastructure, ETSI TS 102 023, Time-Stamp Protocol, Electronic Signatures and Infrastructures (ESI) Policy requirements for time-stamping authorities y ETSI TS 101 861, Time stamping profile. Currently, the Camerfirma time synchronization service consists of three different sources:

  • NTP of ROA (Royal Observatory of the Navy) that establishes the reference time in Spain via RedIris.
  • GPS synchronized 3 satellites. 30 milliseconds of precision.
  • Time synchronization via DCF77 Radio with the transmitting station of Mainflingen (near Frankfurt). 10 milliseconds precision.

The system calculates the time based on these three sources. The computer clock is controlled according to the selection algorithms and the synchronization of the RFC1305 (NTP v3). The AC Camerfirma time stamping service can perform the user authentication via username/password or digital certificate.

  • AC Camerfirma time stamping service features Download (105KB)
  • Settings of the AC Camerfirma time stamping in Adobe Writer Download (113KB)

TSA1 Service. Authenticated time Stamps by username and password.

Access point http://tsa.camerfirma.com:5000 Stamping Policy: 1.3.6.1.4.1.17326.10.13.1.3.1 Download the certificate to validate the time stamps issued:

SMART-TSA Service. Autenticated time Stamps.

Login and password autenticated access point: http://tsu2.camerfirma.com:8884/tsc

Certificate autenticated acces point: https://tsu2.camerfirma.com:8883/tsc

Stamping Policy: 1.3.6.1.4.1.17326.10.13.1.2.1 Download the certificate to validate the time stamps issued:

TSA Service. Autenticated time Stamps.

Login and password autenticated access point: http://tsu.camerfirma.com:5000/ts.inx

Certificate autenticated acces point: https://tsu.camerfirma.com:5001/ts.inx

Stamping Policy 1.3.6.1.4.1.17326.10.13.1.3.1 Download the certificate to validate the time stamps issued:



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