The Implementation of Security Message Protocol for PDA PUSH Service

In this paper, we propose and implement a service model to transfer messages safely for PDA on CDMA wireless networks and a secure message transfer protocol which considers characteristics of PDA. The proposed PUSH service uses SMS (short message service) to connect an offline client device with the wired network for data communication. After receiving SMS message, client device process the SMS message and creates a data channel thought RAS (remote access service), and then the data of the server can be pushed to client. The implemented securing protocol can provide safe data transmission on each communication channel thought two way channels of SMS and data. This protocol can reduce a number of transmissions for exchanging a safe session key by using security nonce table. As a result, intensity of encryption can be increased.