Verifying Sign with Singpass signatures

Sign with Singpass signatures can be verified using the Adobe Acrobat Reader application. This should already be installed on your government devices. However, if you are verifying on a non-government device, please:

• download Adobe Acrobat Reader here

• load Singpass root signing certificates

Please ensure that your agency does not modify the file in transit (content disarm and reconstruction) as this will render the file not verifiable.

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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.

1. 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.

1. Click on each signature and inspect certificate

Go into signature properties

Show signer's certificate

Certificate should include the following:

• Singapore National Root CA - G1

• Singapore NDI Intermediate CA 1 - G2

• 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.