# 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](https://get.adobe.com/uk/reader/)
* load [Singpass root signing certificates](/user-guides/certificate-guide/loading-singpass-root-signing-certificate.md)

{% hint style="info" %}
Please ensure that your agency does not modify the file in transit (content disarm and reconstruction) as this will render the file not verifiable.
{% endhint %}

***

### 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"**

<figure><img src="/files/bs3Mk3HtVWuwGId0GjV9" alt=""><figcaption></figcaption></figure>

{% hint style="info" %}
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](/user-guides/certificate-guide/loading-singpass-root-signing-certificate.md) to install the Singpass root signing certificate.&#x20;
{% endhint %}

3. **Go to signature panel**

<figure><img src="/files/QWv0x0Zn3QMlB3S9OQpW" alt=""><figcaption></figcaption></figure>

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

<figure><img src="/files/3p0AbliVoVuBAJxYciqg" alt=""><figcaption></figcaption></figure>

Document owner should "click to view this version" to visually inspect that the contents of the document version is signed correctly.

<figure><img src="/files/HYmUkvgQ3MYDzMBOva8W" alt=""><figcaption></figcaption></figure>

4. **Click on each signature and inspect certificate**

<figure><img src="/files/B3sOmOXRK46TnS0egxfo" alt=""><figcaption></figcaption></figure>

Go into signature properties

<figure><img src="/files/os1bgvi7u8UEZLdaIL0o" alt=""><figcaption></figcaption></figure>

Show signer's certificate

<figure><img src="/files/k1LZQ747nUdRueSyM1uK" alt=""><figcaption></figcaption></figure>

Certificate should include the following:

* Singapore National Root CA - G1
* Singapore NDI Intermediate CA 1 - G2
* Signer's full name (as per NRIC)

<figure><img src="/files/Nyj1xsTRQQQfLr1Gzixv" alt=""><figcaption></figcaption></figure>

Click the full name and then "details"

<figure><img src="/files/glf19M4DjCFuyqkGMmmd" alt=""><figcaption></figcaption></figure>

Check under subject that signer's name and last 4 characters of NRIC is correct.

<figure><img src="/files/Sl8D2quOUSayY2sf8A8e" alt=""><figcaption></figcaption></figure>


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# Agent Instructions: Querying This Documentation

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```
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```

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