Sign with Singpass signatures can be verified using PDF reader software, such as Adobe Acrobat Reader application (download here).
Please ensure that the document has not been modified since your signature has been created, as this will invalidate the signature.
Verifying signatures with Adobe Acrobat Reader
Please follow the steps below to verify a Sign with Singpass signature.
1
Open up signed document on Adobe Acrobat Reader
2
Check if green tick with "Signed and all signatures are valid"
If you see "Certificate validity is unknown", this is because you do not have the Singpass root signing certificate on your device. Please refer to this guide to install the Singpass root signing certificate.
3
Go to signature panel
In signature panel, each signature should show:
Document has not been modified
Signer's identity is valid
The signature includes an embedded timestamp
Signature is long term validation (LTV) enabled
Document owner should "click to view this version" to visually inspect that the contents of the document version is signed correctly.
4
Right-click on each signature and select "Show Signature Properties".
The following modal should appear, and it will tell you:
The name of the signer (e.g. "MICHAEL ONG")
The time the document was signed
If you select "Show Signer's Certificate" at the bottom, you will see another modal with details about the certificate. Ensure that the the following details are correct:
Singapore National Root CA - B1
Singapore NDI Intermediate CA 1 - B2
Signer's full name (as per NRIC)
Click the full name and then "details".
Check under "Subject" that signer's name and last 4 characters of NRIC is correct.
