Frequently Asked Questions

The Single Sign-On (SSO) Portal allows users to securely authenticate once, and then automatically access integrated systems in NSI without needing to enter their credentials.

To use the portal, you need the following:

• Operating System: Windows 10, Windows 11, Linux or macOS
• Web Browser: Firefox, Chrome, or Edge
• Software for electronic signature processing: BISS

The portal works with the providers listed in the Registry of Certification Service Providers in Bulgaria, maintained by the Communications Regulation Commission (CRC). The providers included in the national trusted list for qualified certification services are:

• “BORICA” AD
• “Evrotrust Technologies” AD
• “Infonotary” EAD
• “Information Services” AD
• “SEP Bulgaria” AD

To use the portal, you need to have BISS (Browser Independent Signing Service for electronic signature processing) software installed on your computer. You can download the software from https://www.b-trust.bg/services/software

You can authenticate using one of the following methods:

1. Qualified Electronic Signature (QES)
2. Personal Identification Code (PIC) from NRA
3. E-authentication (for natural person only)
4. Username and password (for BULSTAT / Surveyors)