Gpg4win (GNU Privacy Guard for Windows) is an encryption software that provides a robust suite of tools for secure email and file encryption. The software is designed primarily for the Windows operating system, aiming to make data communication and storage secure against unauthorized access. Gpg4win supports both the OpenPGP and S/MIME protocols, ensuring compatibility with a wide range of international security standards.The package includes several key components such as GnuPG, Kleopatra (a certificate manager for OpenPGP and X.509), GpgOL (a plugin for Microsoft Outlook), and GpgEX (a plugin for Windows Explorer). These tools facilitate cryptographic operations such as encryption, decryption, digital signing, and key management.Gpg4win is available free of charge and its development is actively supported by contributions from users and sponsors. It serves both individual and enterprise needs, providing strong encryption for sensitive information. The source code is openly available, allowing users to verify security and compliance with privacy standards.