Kdecrypt

<p align="center"> <img src="icons/sc-apps-kdecrypt.svg" width="128" height="128" alt="KDecrypt"> </p> <h1 align="center">KDecrypt</h1> <p align="center"> A KDE Plasma application for encrypting, decrypting, and managing PGP/GPG files and keys. </p> <p align="center"> <a href="https://github.com/Guid-Lab/kdecrypt/actions"><img src="https://github.com/Guid-Lab/kdecrypt/actions/workflows/build.yml/badge.svg" alt="Build"></a> <a href="LICENSES/GPL-3.0-or-later.txt"><img src="https://img.shields.io/badge/License-GPL--3.0--or--later-blue.svg" alt="License"></a> <img src="https://img.shields.io/badge/KDE_Frameworks-6-green.svg" alt="KDE Frameworks 6"> <img src="https://img.shields.io/badge/Qt-6-green.svg" alt="Qt 6"> </p> <p align="center"> <img src="screenshots/main.png" width="680" alt="KDecrypt main window"> </p>

Features

• Decrypt .pgp, .gpg, .asc encrypted files
• Encrypt files for multiple recipients with optional signing
• Full GPG key management (generate, import, export, delete)
• Passphrase storage via KDE Wallet
• Drag-and-drop support for quick file decryption
• Open decrypted files with default applications
• Remember encrypted files between sessions
• Switchable interface language
• Built-in handbook (English, Polish)

Security

KDecrypt is designed with security in mind:

• In-memory AES-256-GCM encryption — decrypted file contents are stored in memory using authenticated encryption with a random key generated at startup; protects against memory dumps and swap file leaks
• Secure wiping — decrypted data buffers are overwritten with zeros before being freed
• No temporary files — decrypted data is never written to disk unless you explicitly save it
• Safe passphrase handling — passphrases are passed to GPG via file descriptor, never via command-line arguments

Dependencies

Build

• CMake >= 3.20
• Qt 6 (Core, Gui, Widgets)
• KDE Frameworks 6: CoreAddons, I18n, XmlGui, WidgetsAddons, Wallet, DBusAddons, WindowSystem, DocTools
• Extra CMake Modules (ECM)
• OpenSSL
• gettext

Runtime

• GnuPG (gpg)
• KDE Wallet (kwallet)
• KHelpCenter (for the built-in handbook)

Arch Linux / CachyOS

sudo pacman -S cmake extra-cmake-modules qt6-base qt6-tools \
  kcoreaddons ki18n kxmlgui kwidgetsaddons kwallet kdbusaddons \
  kwindowsystem kdoctools openssl gettext

sudo pacman -S gnupg kwallet khelpcenter

Debian / Ubuntu

sudo apt install cmake extra-cmake-modules qt6-base-dev \
  qt6-tools-dev libkf6coreaddons-dev libkf6i18n-dev \
  libkf6xmlgui-dev libkf6widgetsaddons-dev \
  libkf6wallet-dev libkf6dbusaddons-dev libkf6windowsystem-dev \
  libkf6doctools-dev libssl-dev gettext

sudo apt install gnupg kwalletmanager khelpcenter

Fedora

sudo dnf install cmake extra-cmake-modules qt6-qtbase-devel \
  qt6-qttools-devel kf6-kcoreaddons-devel kf6-ki18n-devel \
  kf6-kxmlgui-devel kf6-kwidgetsaddons-devel \
  kf6-kwallet-devel kf6-kdbusaddons-devel kf6-kwindowsystem-devel \
  kf6-kdoctools-devel openssl-devel gettext

sudo dnf install gnupg2 kf6-kwallet khelpcenter

Building

cmake -B build -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr
cmake --build build

Installing

sudo cmake --install build

Usage

Launch KDecrypt from the application menu or run kdecrypt from the terminal.

| Shortcut | Action | |----------|--------| | Ctrl+O | Decrypt file | | Ctrl+E | Encrypt file | | Ctrl+K | Key Manager | | Ctrl+S | Save decrypted file | | Return | Open with default app | | Delete | Remove from list | | F1 | Open handbook |

You can also associate .pgp/.gpg files with KDecrypt in Dolphin for one-click decryption, or drag encrypted files directly onto the window.

License

This project is licensed under the GPL-3.0-or-later.

REUSE-compliant. See REUSE for details.

Contributing

Report bugs and feature requests at github.com/Guid-Lab/kdecrypt/issues.