Gpg

Here's my public key, should you ever want to validate something from me

-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1.4.10 (GNU/Linux)

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=f/mP
-----END PGP PUBLIC KEY BLOCK-----

usage

simple usage to encrypt a file with just a passphrase (no need for keys)

gpg -c filename

for batch use, you can put --passphrase <phrase> into the command

gpg -c --passphrase <phrase> filename

you can mix this with other arguments such as -e -r <email> to encrypt to a key

gpg -e -r person@example.test -c --passphrase <phrase> filename

Adding -a to the command line above will encode the output suitably for sending in plain text.

idea cypher/cipher

Should you get messages along the line of:

gpg: key 1D9EB6CD: secret key imported
gpg: key 1D9EB6CD: no valid user IDs
gpg: this may be caused by a missing self-signature
gpg: key 1D9EB6CD: no valid user IDs
gpg: this may be caused by a missing self-signature

or

gpg: protection algorithm 1 (IDEA) is not supported
gpg: the IDEA cypher plug-in is not present
gpg: please see http://www.gnupg.org/faq/why-not-idea.html for more information
Can't edit this key: unknown cypher algorithm

You may from time to time end up having to import keys that were created using the IDEA cipher. GnuPG doesn't support IDEA out of the box. So in order to get this functionality you will have to follow the following:

download and build the module

It's quite simple, although the FTP server doesn't seem to be configured correctly any more, following the link at http://www.gnupg.org/faq/why-not-idea.html, so I've put it on my site, here: idea.c.gz.

Uncompress:

$ gunzip idea.c.gz

$ gcc -Wall -O2 -shared -fPIC -o ~/.gnupg/idea idea.c

configure gpg

Once that's done, load the module in your .gnupg/gpg.conf:

load-extension ~/.gnupg/idea

summary

Once done you can then use the keys. Unfortunately the IDEA algorithm is not patent free, and as such it angers me whenever I have to use an IDEA based key.