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Keysign

Keysign is an email client, available on Linux.

  • Completely free
  • Linux
  • Open source

Overview

Keysign is an email client, available on Linux.

Services and protocols mentioned: Bluetooth.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information
  • “It follows best practises by sending the encrypted signatures to the UIDs of a key using the Email client the user configured to use.” — Flathub, 10 November 2026

At a glance

All of Keysign is free: no feature is locked behind a paid plan, and its code is open.

Its licence (GPL-3.0+) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

  • Open source code
  • Commercial use allowed

About

GNOME Keysign allows signing OpenPGP keys comfortably and securely via the local network or Bluetooth. It can scan another key's barcode and transfer the key securely, allowing for casual two-party key signing sessions. It follows best practises by sending the encrypted signatures to the UIDs of a key using the Email client the user configured to use.

Description from Flathub — AppStream (Flathub)

Sources and checks

  • Facts collected from Flathub (credit card, source code, publisher, licence, free status, platforms, commercial use, version) —
  • Last technical check: 8 November 2026
  • Description from Flathub — AppStream (Flathub)

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