PGP integration to be able to subscribe and may encrypt communication

[Mannshoch]

Add PGP support and allow to subscribe all tickets and if wished also encrypt mails.

A proposal for how to use PGP encryption with Zammad.

• User-Mail → Zammad → User-PGP-key → encrypted in database → Agent-PGP-Key → mail
  • Zammad-Web for customer is able to read mails and also Zammad-Web for agent
• User-PGP-MailAPP → zammad → encrypted in database → agent → Agent-PGP-MailAPP
  • Zammad-Web could not read the mail, and if the key from the agent is not the same like the one in his mail app also the Zammad-Web the agent use could not read the mail.

Details for the proposal

1. Create a Zammad PGP Key for all registered user and store it in their user-profil
2. Allow user to add their own Public Key or deactivate the key created by Zammad
3. On company side the keys are created by the outgoing mail-address not the mail-address by the agents mail
   • Except customer have a dedicated secure-supporter
4. If we set a user to secure communication:
   1. All Message get encrypted by the customers public key
      • If Zammad key is deactivated and no other is set, the customer has to communicate with his own PGP Mail app.

Other Post with this Feature request

• PGP/GPG integration
• PGP · Issue #220 · zammad/zammad · GitHub

Other with web based PGP:

• GitHub - tacruc/gpgmailer: Send encryped emails to registered users

Webkey directory (.well-known)

• Setting Up a PGP Webkey Directory - Tyil