How does MAC system work and how does the private key and the public key works?

This forum is for Mac OS X, not MAC (Media (Medium) Access Control). I'm also not sure what your question is. MAC is an addressing mechanisim, where priviate/public key cryptography is a seperate mechanisim that works individually of MAC.

__________________
Scott Meyers
Acquisitions Editor
Wiley/Wrox Publishing

Hi
Thanks for your attention ,but my question was about Mac
I would thank to you if you answer my question.