The Crypt::* modules are pretty easy to use; I have a project where I ask for authentication information if there's a setup command line switch, encrypt it, and write it into stored configuration. For normal runs, the stored configuration is read and decrypted. If you keep your configuration file safe and use a static machine attribute as the password (for instance Processor ID), it'll be reasonably secure and transparent to the user.
"Nothing was broken, and it's been fixed." -- Jon Carroll
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