GST emSigner 3.3: New DSC Token Compatibility Update
The GST Portal has issued advance information on the availability of emSigner version 3.3 for taxpayers and tax officers who use Digital Signature Certificates (DSCs) on the GST System.
The new version is being introduced to support compatibility with new USB DSC tokens issued on or after 21 September 2026. Users with existing valid DSC tokens that continue to work normally do not need to upgrade immediately.
Who Needs to Upgrade to emSigner 3.3?
The requirement depends on the DSC token being used.
Users With Existing Valid DSC Tokens
If an existing DSC and its USB dongle are working normally as of 21 September 2026, users may continue using their current version of emSigner.
However, users should upgrade to emSigner 3.3 if:
- DSC signing fails; or
- The certificate does not appear for selection despite the token drivers being correctly installed.
Version 3.3 is stated to be backward compatible with existing tokens.
Users With Newly Issued DSC Tokens
Users who receive a new USB DSC token on or after 21 September 2026 must upgrade to emSigner version 3.3.
This includes cases where:
- A new digital certificate and dongle are issued.
- An existing certificate is renewed using a new dongle.
The older emSigner versions will not work with such new DSC dongles.
What Are the System Requirements for emSigner 3.3?
Before installing the new version, users should ensure that their desktop, laptop or all-in-one system meets the specified requirements.
Operating System and Hardware
| Requirement | Minimum Specification |
|---|---|
| Operating System | Windows 10/11 64-bit; Ubuntu 18 or above; macOS 10.6 or above |
| System Type | 64-bit |
| RAM | 8 GB or above |
| Storage | 64 GB or above |
Java Requirements
emSigner 3.3 requires Java 1.8, using either OpenJDK or Oracle Java.
Users should note that:
- Java must already be installed on the system.
- Java is not bundled with the emSigner installer.
- Java 9 and later versions are not supported.
Supported Browsers
The advisory lists support for Internet Explorer, Firefox, Chrome, Safari, Opera and Microsoft Edge, subject to the versions specified in the GST Portal advisory.
How Can Users Install emSigner 3.3?
Users requiring version 3.3 can download it from the GST Portal.
Installation Steps
Step 1: Check that the computer meets the required operating system, hardware and Java specifications.
Step 2: Download and install emSigner version 3.3 from the GST Portal’s emSigner download section.
Step 3: Connect the DSC USB token and verify that the required token drivers are installed correctly.
Step 4: Test the DSC functionality on the GST Portal.
What Happens to Existing DSCs?
The advisory also clarifies the position regarding existing DSCs and the transition to newer security standards.
According to the referenced CCA migration advisory, DSCs downloaded onto FIPS 140-2 dongles on or before 21 September 2026 can continue to be used until the DSC expires.
The date does not automatically invalidate existing DSCs.
For subsequent renewal or fresh issuance, the applicable requirements relating to FIPS 140-3 dongles should be considered, subject to the exceptions specified by the CCA.
Note:
Taxpayers should check their DSC token status before a GST filing or other signing activity. If the existing DSC works normally, an immediate upgrade is not required solely because emSigner 3.3 has been released.
Key Takeaway
The introduction of emSigner 3.3 primarily addresses compatibility with new DSC USB tokens issued from 21 September 2026.
Taxpayers using newly issued tokens should upgrade before attempting digital signing on the GST Portal, while users with existing working tokens can continue with their current emSigner version unless they experience signing or certificate-selection issues.
Conclusion
The GST Portal’s emSigner 3.3 advisory provides users with advance information about the transition to compatibility with newly issued DSC tokens. Businesses and tax professionals should verify their token type, ensure their systems meet the specified requirements and install emSigner 3.3 where applicable to avoid digital-signature issues during GST-related activities.
Notification Reference:
GSTN
19/09/2026