Kgpg is a simple, free, open source KDE frontend for GnuPG.

Basic features:
- Editor mode enables you to type/copy a text and encrypt/decrypt/sign/verify
it
- File encryption: right click on a file to encrypt it (Kgpg adds "encrypt
file" option in Konqueror's menus)
- Encryption: support for symetric encryption. Multiple keys & default
key encryption. Optional shredding of source files
- File decryption: left click on an encrypted file or drop it into Kgpg & it
will automatically start decryption
- Signatures: creation & verification of detached & cleartext signatures
- Key management: import, export, delete, sign, generate and edit keys.

WWW: http://developer.kde.org/~kgpg/