How to Sign on Linux
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How to Sign on Linux

Via Graphical Interface

Installation

Install the scdaemon and kleopatra packages

Configuration

Similar to the one on Windows

Producing a Signature

  1. Open Kleopatra
  2. Click the "Sign/Encrypt" button
  3. Select the file
  4. Uncheck both "Encrypt..." options and choose the output file/folder at the bottom where the signature will be written.
  5. Retrieve all the contents of the signature file.

Command Line

Installation

Install the `gpg` package ("sudo apt-get install gpg" on Debian-based distributions)

Configuration

You need to have a key pair, for better confidentiality, avoid providing an email address and use a separate key pair for each social group. For instance, you can create a key pair specifically for Comind.

To create a key pair for Comind interactively: gpg --full-generate-key (choose the options listed below)

Or more quickly:

gpg --batch --generate-key &lf;<EOF
Key-Type: RSA
Key-Length: 4096
Name-Real: Anonymous
Expire-Date: 0
%no-protection
%commit
EOF

Producing a Signature

  1. To produce a signature for "3.jpg": gpg --armor --detach-sign <3.jpg
  2. Copy the signature: from -----BEGIN PGP SIGNATURE----- to -----END PGP SIGNATURE----- inclusive.

Saving Keys

Save ~/.gnupg