A Cryptographic Timestamping RFC3161 (requiring accuracy of second) is important mechanism for the long-term preservation of e-signatures, data sealing, proving document originality. Any place where consequences may have a financial impact or penalty of law, the trusted time stamping is no less important than synchronization. It proves non-repudiation when data was created, received or copied. This technology helps protect e-documents and chronology. Public administration chooses mostly NTP (Network Time Protocol).