ACR120 Contactles Card Software Help

Hello, I'm trying to develop a software using ACR120 Contactless Smart Card Reader + 1K Mifare contactless Card. I'm working with C#. I have ACR120 Contactless Smart Card Reader SDK: [login to view URL] So I have sample codes too.. I want to understand the process of securing the data on the card. I want to store some data on the card and i dont want anyone with card tamper data using other card reader. I want to encrypt stored data. There is a key feature on card operations but its not too clear. So as a result; - I want to learn how to use key operations (change key). So it will add protection. - I want to learn how to encrypt data. What is your idea? Or does system has any solution for it? The system has sample codes for: - Visual Basic - Visual C++ - Borland Delphi - VB.NET - Visual C# I can send it what ever you want but I will expect a solution describing how to do it.. So if I cannot create the solution you provided on c# I will except you to create. I'm looking for the way to use keys and encrypt data (also how to decrypt too for future access) If you haven't worked with ACR120 card reader and cards before don't bid. Otherwise I will tell GAF about your bid.. Time is too very critical. So if you dont worked ACR120 before or if you dont know how to do it dont waste my time.. I will require communication over msn or gtalk or skype.. You are going to provide the way to encrypt and key operations, not developing whole software. So budget is limited.. If you bid and send your references i will block you and say you to GAF again. Dont waste my time.