Kleopatra

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Kleopatra is the KDE tool for managing X.509 and OpenPGP certificates in the GpgSM and GPG keyboxes and for retrieving certificates from LDAP and other certificate servers.

Kleopatra's main function is to display and edit the contents of the local keybox, which is similar to GPG's concept of keyrings, albeit one should not stretch this analogy too much.

Features

Importing and exporting of X.509 and OpenPGP certificates

Can decrypt and verify files

Can sign and encrypt files

Can work with CAs and LDAP lookup directories

Embedded GnuPG log viewer

Tools to refresh certificate cache

Configurable certificate list view and automatic certificate processing

A full manual helps you through every detail.