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Encryption

How to Send/Receive encrypted email (OpenPGP, GnuPG, S/MIME)

Basics

Cryptology

Cryptology ensures privacy, integrity and authenticity of your data and communication.

• If you are signing your email the recipient is able to validate content and sender. The recipient can be sure, that the received message has been send by the person and the content hasn’t been manipulate.
• If you encrypt a message, the message can just be read by the recipient. You are able to protect your privacy.

Cryptology via OpenPGP / GnuPG

Overview

OpenPGP is a Standard defined in RFCs. GnuPG is a software to implement those standards.

Generate a key-pair

Use gpg --full-gen-key to generate a key-pair for GnuPG. After generating the key, you can display the private keys via gpg --keyid-format 0xlong -K --fingerprint.

Setup Neomutt

set crypt_use_gpgme=yes
set postpone_encrypt = yes
set pgp_self_encrypt = yes
set crypt_use_pka = no
set crypt_autosign = no
set crypt_autoencrypt = no
set crypt_autopgp = yes 
set pgp_sign_as=0x12345678

Good to know

send2-hook . unset pgp_sign_as
send2-hook '~f box1@domain.tld' set pgp_sign_as=0x12345678
send2-hook '~f box2@domain.tld' set pgp_sign_as=0x87654321