GPG
| What | Where |
|---|---|
| Official Page | |
| Source | |
| Download | |
| Install |
Using a symmetric cypher (AES 256)
Encrypt with symmetric cypher
gpg --symmetric --cipher-algo aes256 -o test.txt.gpg test.txt
Decrypt with symmetric cypher
gpg -d -o test.txt test.txt.gpg
Email setup
Generate Key
gpg --full-generate-key
Export Key
gpg --list-keys
gpg --output mygpgkey_pub.gpg --armor --export ABCDFE01
gpg --output mygpgkey_sec.gpg --armor --export-secret-key ABCDFE01
Alternativly output to console: gpg --armor --export ABCDFE01
Copy Keys
scp mygpgkey_pub.gpg mygpgkey_sec.gpg user@remotehost:~/
Import Key
gpg --import ~/mygpgkey_pub.gpg
gpg --allow-secret-key-import --import ~/mygpgkey_sec.gpg
rm ~/mygpgkey_sec.gpg ~/mygpgkey_pub.gpg
gpg --list-keys
Publish Public Key to Key Server
Key Server
Public Key Server Services
- https://keys.mailvelope.com/
- https://keyserver.ubuntu.com
- http://pgp.mit.edu/
- https://keys.openpgp.org/
gpg --keyserver keyserver.ubuntu.com --send-keys 8CC3D3CDE700B7DE
Search entry on Key Server
gpg --keyserver hkp://keyserver.ubuntu.com --search-key '[email protected]'
Alternativly use the webinterface e.g. https://keys.mailvelope.com/pks/lookup?op=get&[email protected]
Empty file and no PW
It is possible to use GPG without password and even for an empty file:
touch test.txt
gpg --store --armor test.txt
This creates a file called "test.txt.asc" that looked like this:
-----BEGIN PGP MESSAGE-----
owE7zZfEUZJaXKJXUlGSItEdCwA=
=LlM4
-----END PGP MESSAGE-----
Decrypting works too :)
gpg -d test.txt.asc
... and cat test.txt shows an empty file again :)