Discover Linux Softwares to Digital Signatures.
Add digital signatures to your PDFs to verify authenticity and ensure document integrity.
OpenSSL is a robust, commercial-grade, and full-featured toolkit for the Transport Layer Security (TLS) and Secure Sockets Layer (SSL) protocols, as well as a powerful general-purpose cryptography library. It is widely used in web servers, VPNs, and other applications requiring secure communication and data encryption.
GNU Privacy Guard (GnuPG or GPG) is a free and open-source implementation of the OpenPGP standard, widely used for encrypting and signing data and communications. It provides a robust suite of command-line and graphical tools to protect sensitive information.