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# GPG Crypto
## General options
* `--armor` or `-a`: ASCII armor, output is printable ASCII
* `--local-user` or `-u`: specify which ID to use
## Symmetric encryption
### Encrypt file with passphrase
gpg --symmetric <file>
Add `--armor` to make it readable-ASCII encoded.
### Decrypt
gpg --output <out-file> --decrypt <in-file>
## Export private key
gpg --armor --export-secret-keys <ID>
## Export public key
gpg --armor --export <ID> [--output <file>]
## Import key
gpg --import <key file>
## Asymmetric crypto
gpg --encrypt [--sign] [-u <signer>] [--recipient <receipient>] file
## Key management
Add new email to key:
gpg --edit-key <key>
# This gives an interactive shell
> adduid
# interactive form to provide name, email, comment
> save
# saves and quits
Sign a key (changes trust from `unknown` to `full`), apparently necessary for
use in mutt:
gpg --edit-key <key>
> sign
> save
# specify the signing key (by default it's your first one)
gpg --local-user <signing key> --edit-key <key to sign>
## gpg-agent
`gpg-agent` is a daemon that e.g. provides a passphrase cache for GPG. Running
enters an interactive shell. Commands can be also be passed on the command line
as individual arguments.
Configuration in `~/.gnupg/gpg-agent.conf`
* `/bye`: closes connection and shell
* `keyinfo --list`: lists some information about keys
S KEYINFO FE40F504838C6FEDF80C0A592AE43EA8BFFC619E D - - - P - - -
S KEYINFO 8E6D7DD22EA6A76CB7CB4E52315D4F372F67A23C D - - 1 P - - -
The long identifier is a "keygrip", use `gpg --list-keys --with-keygrip` to
match key with keygrip. The 6th column indicates if the passphrase is currently
cached.
* `reloadagent`: restarts the agent.
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