Verifying Sign with Singpass Signatures

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

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".

Select "Show Signer's Certificate".

Certificate should include the following:

• 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.