Study And Design Of Short Message Security Mechanism In CDMA Network

Nowadays, the Short Message Service of communication industry in China has developed as the first places in the world. But Short Message Service problems are more and more complained. And this issue also has the same situation in China Unicom and China Mobile and China telecom. This is because there isn't a safe mechanism about Short Message Authentication of user identities and Short Message content security. We haven't any good method to guarantee or confirm the security of Short Message.Therefore, this paper studies and designs mainly the Identity authentication and certification and the encryption on the handsets and decryption on the Value-Added platform of the Short Message Center as a whole. That is, to resolve the Identity authentication of Short Message accessing CDMA wireless network and the safety of message content when delivering should be realized by these designs. This paper will be mainly designed by CDMA network (from IS-95 CDMA to CDMA2000, short message processes and network structure are the same essentially). This program is a new idea in the Short Message area, the design is following: 1. Short Message authentication of user's identity: it should study in-depthly structure of CDMA network and communication protocol. This paper designs a reasonable Short Message authentication mechanism when user access CDMA network according to no safety mechanism at present.2. According to CDMA mobile terminal characteristics, The Short Message content and recipient numbers finish DES encryption when Short Message sent. In the mobile terminal UIM card is written a sets of key-rows or more key-rows. And each key-row is the counterparts with key. When Short Message sent, the Short Message data packets carry only key-row number to ensure that The Short Message key doesn't transfer directly in the network.3. Short Message value-added business platform is designed as the third-party credible side. And the position of value-added business platform is confirmed in the application of the system. And the Short Message Center confirms the demand for the platform, as well as the agreement when value-added platform connect to Short Message Center. Others, the encrypted Short Message is decrypted on the value-added platform.There is another most important function. The Short Message is decoded on the value-added platform of the Short Message Center when the Short Message is sent. The main idea is we design a Key data in library on the value-added platform of the Short Message Center. Between the Key data in library and the key in the all kinds of mobile phones are counterparts. After the Short Message is decoded, the called number being decoded should be checked once more. Therefore, we can confirm the truth of the caller number which calling user sent in the Short Message Center, and the calling user isn't able to deny the message.4.I would be considered continually that various security problems are encountered on Short Message business in the future.I hope this design could confirm the quality of service and information security in the communication industry in the future. And the Short Message communication technology in China would develop more mature.