Mutual Authentication Technique with Four Entities Using Fuzzy Neural Network in 4-G Mobile Communications

4-G mobile communications system is offering high speed data communications technology having connectivity to all sorts of the networks including 2-G and 3-G mobile networks. Authentication of a mobile subscriber (MS) or a sub network and a main network are an important issue to check and minimize security threats or attacks. An advanced artificial intelligence based mutual authentication system applying fuzzy neural network with four entities is proposed. Voice frequency of the salutation or the selective words used by a subscriber like Hello, Good Morning etc. is taken as first entity. Second entity is chosen as thumb fingerprint matching of the calling subscriber. Then third entity is taken as face image matching of the calling subscriber. Fourth entity is granted as probability of the salutation or the greeting word from subscriber’s talking habit while initializing a call. These four entities such as probability of particular range of frequencies for the salutation word, the thumb fingerprint matching, the face image matching of the subscriber by pixel cluster indexing , using particular salutation or greeting word at the time of starting a call are used with most frequently, more frequently and less frequently by the calling subscriber like uncertainty in Artificial Intelligence (AI). Now different relative grades are assigned for most frequently, more frequently and less frequently used parameters. Fuzzy operations like intersection or minimum and union or maximum are computed taking three membership functions at a time out of four membership functions to adopt fuzzy neural network. Thereafter the optimum or the final fuzzy operations are computed according to the assumed weightages. Lastly the optimized fuzzy operations are defuzzified by Composite Maxima method and the results are tested according to the invented fuzzy neural rule. If the results are satisfactory, the subscriber or the sub network and the network (the switch or the server) are mutually authenticated in 4-G mobile communications.