Trusted Time Stamping


Secure Time Stamp Authority (TSA)

ADSS TSA Server provides independent and irrefutable proof of time for transactions, documents and digital signatures. It can be used to create legal weight evidence that business transactions occurred at a defined moment in time, that e-documents existed at a particular time and that they have not been subsequently altered. It can also independently prove when a digital signature was applied by the signer so that its validity can be verified in the long-term, even after expiry or revocation of signer’s digital credentials.

ADSS TSA complies with the IETF RFC 3161 specifications and can be used for internal TSA needs or it can be used to provide infrastructure-class commercial TSA services to multiple external parties. It offers a number of advantages for managed service providers in the authentication, logging/reporting and token management features.


Key points:

  • RFC 3161 compliant TSA services
  • Supports Microsoft Authenticode timestamps
  • Security management is CWA 14167-1 certified allowing Qualified TSA service to be provided
  • Complies with ETSI TS 101 861 V1.2.1 (2002-03) Time Stamping Profile
  • Meets the ETSI standard TS 102 023 V1.2.1 (2003-01) Time Stamp Authority Policy Requirements
  • Hardware Security Module (HSM) based signing
  • RSA signing with keys of 1024, 2048, 4096 bits
  • ECDSA signing with keys of 192, 224, 256, 384, 521 bits
  • Hash algorithm choice including SHA-1, SHA-2 (SHA-256, SHA-384 and SHA-512). RipeMD is also supported for backward compatibility
  • Time drift monitoring, alerting and service stop features
  • Supports the selection of acceptable hash algorithms
  • Timestamp Token logging, transaction logging and archiving
  • High availability, resilience and high throughput capability
  • User authentication and access control
  • Summary and detailed management reporting
  • Used by many governments as part of national TSA Service, banks & major enterprises

Our Location

Dubai Silicon Oasis Authority,
Headquarters Building
B Wing, Office No. 204
P.O. Box 341061 Dubai, U.A.E.
Tel:  +971 4 501 5457
Fax: +971 4 501 5456