HowTo Crypt/Encrypt some string (e.g. Password) on Qt simple

Here what I have got:

• Qt SDK version 4.6.2
• Windows XP

Question: how can I simply crypt and encrypt simple QString value? I need this to be able to save some crypted string into the INI file, and after reopening application encrypt string to normal password string value.

PS: I'm looking simple and nice solution.

Thanks for help!