Little pictures

[Sascha Kaempf]

Hi List :)

I need you help.

I have to prepare a presentation regarding GnuPG:

1) What is GnuPG ?
2) What are Keys ? Private Key ? Public Key ?
3) What is the difference between sign and encrypt ?

I would like to add some "nice little pictures" to visualize these
topics.

I know it is an unusal question - but does anyone have any links
or pictures handy ?

Thanks and regards
Sascha