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1#GnuPG signature
2## Introduction
3### PGP and GPG
4[Gnu Privacy Guard](https://gnupg.org/) (GnuPG) is an Open Source implementation of the [Pretty Good [](.html)
5Privacy](https://en.wikipedia.org/wiki/Pretty_Good_Privacy#OpenPGP) (OpenPGP) specification. Its main purposes are digital authentication,
6signature and encryption.
7
8It is often used by the [FLOSS](https://en.wikipedia.org/wiki/Free_and_open-source_software) community to verify:[](.html)
9- Linux package signatures: Debian [SecureApt](https://wiki.debian.org/SecureApt), ArchLinux [Master [](.html)
10Keys](https://www.archlinux.org/master-keys/)
11- [SCM](https://en.wikipedia.org/wiki/Revision_control) releases & maintainer identity[](.html)
12
13### Trust
14To quote Phil Pennock (the author of the [SKS](https://bitbucket.org/skskeyserver/sks-keyserver/wiki/Home) key server - http://sks.spodhuis.org/):[](.html)
15
16> You MUST understand that presence of data in the keyserver (pools) in no way connotes trust. Anyone can generate a key, with any name or email address, and upload it. All security and trust comes from evaluating security at the “object level”, via PGP Web-Of-Trust signatures. This keyserver makes it possible to retrieve keys, looking them up via various indices, but the collection of keys in this public pool is KNOWN to contain malicious and fraudulent keys. It is the common expectation of server operators that users understand this and use software which, like all known common OpenPGP implementations, evaluates trust accordingly. This expectation is so common that it is not normally explicitly stated.
17
18Trust can be gained by having your key signed by other people (and signing their key back, too :) ), for instance during [key signing parties](https://en.wikipedia.org/wiki/Key_signing_party), see:[](.html)
19- [The Keysigning party HOWTO](http://www.cryptnet.net/fdp/crypto/keysigning_party/en/keysigning_party.html)[](.html)
20- [Web of trust](https://en.wikipedia.org/wiki/Web_of_trust)[](.html)
21
22## Generate a GPG key
23- [Generating a GPG key for Git tagging](http://stackoverflow.com/a/16725717) (StackOverflow)[](.html)
24- [Generating a GPG key](https://help.github.com/articles/generating-a-gpg-key/) (GitHub)[](.html)
25
26### gpg - provide identity information
27```bash
28$ gpg --gen-key
29
30gpg (GnuPG) 2.1.6; Copyright (C) 2015 Free Software Foundation, Inc.
31This is free software: you are free to change and redistribute it.
32There is NO WARRANTY, to the extent permitted by law.
33
34Note: Use "gpg2 --full-gen-key" for a full featured key generation dialog.
35
36GnuPG needs to construct a user ID to identify your key.
37
38Real name: Marvin the Paranoid Android
39Email address: marvin@h2g2.net
40You selected this USER-ID:
41 "Marvin the Paranoid Android <marvin@h2g2.net>"
42
43Change (N)ame, (E)mail, or (O)kay/(Q)uit? o
44We need to generate a lot of random bytes. It is a good idea to perform
45some other action (type on the keyboard, move the mouse, utilize the
46disks) during the prime generation; this gives the random number
47generator a better chance to gain enough entropy.
48```
49
50### gpg - entropy interlude
51At this point, you will:
52- be prompted for a secure password to protect your key (the input method will depend on your Desktop Environment and configuration)
53- be asked to use your machine's input devices (mouse, keyboard, etc.) to generate random entropy; this step _may take some time_
54
55### gpg - key creation confirmation
56```bash
57gpg: key A9D53A3E marked as ultimately trusted
58public and secret key created and signed.
59
60gpg: checking the trustdb
61gpg: 3 marginal(s) needed, 1 complete(s) needed, PGP trust model
62gpg: depth: 0 valid: 2 signed: 0 trust: 0-, 0q, 0n, 0m, 0f, 2u
63pub rsa2048/A9D53A3E 2015-07-31
64 Key fingerprint = AF2A 5381 E54B 2FD2 14C4 A9A3 0E35 ACA4 A9D5 3A3E
65uid [ultimate] Marvin the Paranoid Android <marvin@h2g2.net>[](.html)
66sub rsa2048/8C0EACF1 2015-07-31
67```
68
69### gpg - submit your public key to a PGP server (Optional)
70``` bash
71$ gpg --keyserver pgp.mit.edu --send-keys A9D53A3E
72gpg: sending key A9D53A3E to hkp server pgp.mit.edu
73```
74
75## Create and push a GPG-signed tag
76
77See [Release Shaarli](Release-Shaarli.html).