A digital signature validates the authenticity and integrity of electronic documents the same a signature or stamp (produced by hand) does. However, a digital signature is considerably more secure than a handwritten signature.
By the time you are done reading this article, you will have learned how to use Java to add a digital signature to a PowerPoint presentation.
- Java API to Add Digital Signature to PowerPoint PPT
- Run Java Code to Add Digital Signature to PPT
- Use Java to Verify Digitally Signed PowerPoint
Java API to Add Digital Signature to PowerPoint PPT#
If you are looking to add a digital signature to a PPT presentation with just a few lines of Java code, then you need:
- Aspose.Slides for Java, a powerful PowerPoint library used to create, edit, and manipulate PPT and PPTX presentations. For instructions on installing Aspose.Slides, see this Installation guide.
- A signing certificate: Before you create a digital signature, you need a signing certificate first. Such certificates are typically issued by known certification authorities (CA), but you can also create your own certificate.
A digital signature must meet these criteria: use a valid signature, the certificate associated with it must be current (not expired), and (ideally) it should come from a reputable or well-known certificate authority, and the signer or signing organization must be trusted.
Java Code to Add Digital Signature to PPT#
With your digital certificate in hand and Aspose.Slides installed on your system, you have to follow these instructions to add a digital signature to a PowerPoint presentation in Java:
- Using the Presentation class, load the relevant PowerPoint file.
- Create a digital signature object and then pass the digital signature PFX file and password to it.
- Add the digital signature.
- Save the changed presentation.
This Java code shows you how to add a digital signature to a PowerPoint:
Verify Digitally Signed PowerPoint PPT in#
If you receive a PowerPoint with a digital signature, you run a verification operation to check and confirm that the file in your hands was not modified after it got signed. This process is essentially a test of the authenticity and integrity of a PPT or PPTX presentation.
Follow these instructions to verify a PowerPoint that has been signed with a digital signature:
- Using the Presentation class, load the relevant PowerPoint file.
- Check whether the PowerPoint is signed.
- Check whether the signatures (used to sign the presentation) are valid.
Run this Java code to verify a digitally signed PowerPoint document:
Get a Free License#
If you are looking to try Aspose.Slides features without limitations, we recommend you get a free temporary license.
Conclusion#
We believe you now know how to use Java to add digital signatures to PowerPoint presentations. Other security-themed articles—such as an article on password-protecting a PowerPoint presentation—may come in handy.
To learn more about Aspose.Slides features, see our documentation. If you have questions, you can post them on our forum.