How to add digital signature to pdf with cac card. . Jul 2, 2025 · Digital signatures provide a crucial layer of security and trust for electronic documents. To get started, make sure you have the necessary software, like Adobe Acrobat Reader, and your CAC card reader installed. Step-by-step guide, system requirements, and fixes for common CAC signature issues. 19, over 100 leaders and colleagues, past and present, gathered to honor Kevin J. Jones, associate director for Security Training at the Defense Counterintelligence and Security Agency (DCSA). So, let's get started. Here we will show you how to add a CAC signature to PDF. Simply open your PDF, insert your CAC into the reader, and follow the on-screen prompts to sign the document securely. Digital signatures in Adobe Acrobat allow you to securely sign documents using a verified identity, ensuring authenticity and integrity.