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security/split-gpg.md
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@ -14,11 +14,10 @@ redirect_from:
- /wiki/UserDoc/OpenPGP/
---
Qubes Split GPG
===============
# Qubes Split GPG #
## What is Split GPG and why should I use it instead of the standard GPG? ##
What is Split GPG and why should I use it instead of the standard GPG?
----------------------------------------------------------------------
Split GPG implements a concept similar to having a smart card with your
private GPG keys, except that the role of the "smart card" plays another Qubes
AppVM. This way one, not-so-trusted domain, e.g. the one where Thunderbird is
@ -76,8 +75,7 @@ could start a Disposable VM and have the to-be-signed document displayed
there? To Be Determined.
Configuring Split GPG
---------------------
## Configuring Split GPG ##
In dom0, make sure the `qubes-gpg-split-dom0` package is installed.
@ -146,7 +144,9 @@ only `gpg2`). If you encounter trouble while trying to set up Split-GPG, make
sure you're using `gpg2` for your configuration and testing, since keyring data
may differ between the two installations.
## Using Thunderbird + Enigmail with Split GPG ##
## Qubes 3.2 Specifics ##
### Using Thunderbird + Enigmail with Split GPG ###
However, when using Thunderbird with Enigmail extension it is
not enough, because Thunderbird doesn't preserve the environment
@ -171,6 +171,21 @@ passphrase from your (sub)key(s) in order to get Split-GPG working correctly.
As mentioned above, we do not believe PGP key passphrases to be significant
from a security perspective.
## Qubes 4.0 Specifics ##
### Using Thunderbird + Enigmail with Split GPG ###
New qrexec policies in Qubes R4.0 by default require the user to enter the name
of the domain containing GPG keys each time it is accessed. To improve usability
for Thunderbird+Enigmail, in `dom0` place the following line at the top of the file
`/etc/qubes-rpc/policy/qubes.Gpg`:
```
work-email work-gpg allow
```
where `work-email` is the Thunderbird+Enigmail AppVM and `work-gpg` contains
your GPG keys.
## Using Git with Split GPG ##
Git can be configured to used with Split-GPG, something useful if you would
@ -227,23 +242,9 @@ displayed to accept this.
<br />
Qubes 4.0
---------
New qrexec policies in Qubes R4.0 by default require the user to enter the name
of the domain containing GPG keys each time it is accessed. To improve usability
for Thunderbird+Enigmail, in `dom0` place the following line at the top of the file
`/etc/qubes-rpc/policy/qubes.Gpg`:
```
work-email work-gpg allow
```
where `work-email` is the Thunderbird+Enigmail AppVM and `work-gpg` contains
your GPG keys.
## Advanced: Using Split GPG with Subkeys ##
<br />
Advanced: Using Split GPG with Subkeys
--------------------------------------
Users with particularly high security requirements may wish to use Split
GPG with [​subkeys]. However, this setup
comes at a significant cost: It will be impossible to sign other people's keys