What Timestamp Servers to Use when Signing PDF Documents

Q: I want to add timestamps when adding digital signatures to PDF documents in PDF Studio. Do you have a list of timestamp servers available? A: In PDF Studio version 2020, we added support for SHA512 algorithm for communication with timestamp servers.  This FreeTSA – Guide recommends using SHA-512. SHA-512 is part of SHA-2 (read […]

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New “Fast Sign” Signature Stamps

The new Fast Sign tool, introduced in PDF Studio 2018, allows you to create electronic signature stamps that can be easily applied to documents. The Fast Sign signature stamp is a graphical representation of a signature on pen and paper such as an image or drawing. The stamps can be created using a signature font, […]

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Creating Self-Signed Digital IDs for signing PDF documents

Q: How to create self-signed digital IDs in PDF Studio? A: In order to sign documents, you must first have a digital ID. If you do not have an existing ID, you can use PDF Studio to create a new digital ID to be used when signing documents. When creating a digital ID with PDF Studio, it is considered a “Self-Signed Digital ID” which means that it was not issued by […]

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How to setup USB Smart Card Hardware PKCS11 signing on Mac

Q: I need to sign PDF documents with my USB Smart Card. Can I do that using PDF Studio on my Mac system? A: Yes, you can. Starting in PDF Studio 11.0.4, we allow users to sign a document using their USB Smart Card. You can see the setup below as a reference. In this example, we used […]

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Signing PDFs with DOD CAC (Common Access Card) under Linux

Q: I work in the Air Force and have a requirement to digitally sign .pdf forms with my Common Access Card (CAC -> militaryID). Does the digital signing capabilities of your software PDF Studio interact with linux’s libcackey or your own libraries to enable digital signing of documents? Will my CAC work with your software? […]

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How to setup USB Smart Card Hardware PKCS11 signing on Linux

Q: I need to sign PDF documents with my USB Smart Card. Can I do that using PDF Studio on my Linux system? A: Yes, you can. Starting in PDF Studio 10.1.0, we allow users to sign a document using their USB Smart Card. You can see the setup below as a reference. In this example, we […]

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Multiple digital signatures on a PDF document

The PDF format was not designed to support multiple signatures. Advanced PDF viewers perform a trick when validating multiple signatures:  they analyze the content that was added to see what was added after the first signature. If only a second signature was added, they show the first signature as valid. PDF Studio version 9 and […]

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