need good resources about {on the fly encryption or Real-time encryption}

I need to Know about on fly encryption or Real-time encrypt开发者_开发问答ion because I am trying to implement real time encryption which is some thing smiler to truecrypt (just the idea of the real-time encryption technique)

so where can i find a good resource talking about solid concepts in the field of this topic.

I have experience using public key encryption and also symmetric key encryption.