For those who need to encrypt some files in a secure manner with a password, I personaly use the open source CCRYPT
http://ccrypt.sourceforge.net/
The reason I use it is simple. It is multi-platform in every way, so I can encrypt my files safely knowing I'll be able to decrypt them anywhere else (Windows, BeOS, any UNIX, etc..)
I use it to secure my password file list (Openoffice spreadsheet in excel format .xls)
It is a command line utility, easy to use with a very secure algorithm.
Anyway i was looking to integrate it into KDE and I fell onto this little gem while surfing. It'a a bunch of simple scripts used to integrate ccrypt on different paltforms file managers.
KDE is included and all I need to do now after running the script to encrypt or decrypt a file now is right click it and pick the proper menu item.
Just thought I would share this.