The digital signature is a well-known and commonly used way of protecting digital documents. It makes it easier to validate the authenticity of the content in a document. Thus, you can identify if someone attempted to tamper with the document. MS PowerPoint also allows you to sign the PPT or PPTX presentations with digital signatures. To automate this feature programmatically, this article covers how to add digital signatures to PowerPoint PPT files in Python.
- Python Library to Digitally Sign PowerPoint Files
- Add Digital Signature to PPT in Python
- Verify a Digitally Signed PPT
Python Library to Digitally Sign PowerPoint PPT
To add digital signatures in PowerPoint presentations, we will use Aspose.Slides for Python via .NET. It is a powerful Python library that allows you to create and manipulate PowerPoint presentations without writing complex code. You can install the library from PyPI using the following pip command.
> pip install aspose.slides
Add Digital Signature to PPT in Python
To sign a document with a digital signature, you first need to obtain a certificate from an authorized organization/person known as a certificate authority. This certificate is used to uniquely identify the person who owns it.
Once you have the digital certificate, you can follow the below steps to add digital signatures to a PowerPoint PPT in Python.
- First, open the PPT/PPTX using Presentation class.
- Then, load the digital signature using DigitalSignature class by providing file’s path and password.
- Add comments using DigitalSignature.comments property.
- Add digital signature to presentation using Presentation.digital_signatures.add(DigitalSignature) method.
- Finally, save the presentation using Presentation.save(string, SaveFormat) method.
The following code sample shows how to add a digital signature to a PowerPoint PPT in Python.
Verify a Digitally Signed PPT in Python
Aspose.Slides also allows you to verify if a digitally signed PPT is modified or not. The following are the steps to validate digital signatures in a PowerPoint presentation in Python.
- First, open the PPT/PPTX using Presentation class.
- Then, check if PPT is digitally signed or not.
- For each digital signature in Presentation.digital_signatures collection, perform following steps.
- Use DigitalSignature.is_valid to validate the signature.
- If it returns false, the presentation is modified otherwise it is not.
The following code sample shows how to validate digital signatures in a PowerPoint PPT in Python.
Get a Free License
You can get a free temporary license to use Aspose.Slides for Python via .NET without evaluation limitations.
Conclusion
In this article, you have learned how to add digital signatures to PowerPoint PPT or PPTX files in Python. Moreover, you have seen how to validate the digital signatures to check if the presentation is modified or not. You can explore other features of Aspose.Slides for Python using the documentation. Also, you can ask your questions on our forum.
