Identity-Based Cryptography for Securing Mobile Phone Calls

In this paper, an identity-based key agreement system for mobile telephony in GSM and UMTS networks is presented. The use of telephone numbers as public keys allows the system to piggyback much of the security overhead for key management to the existing GSM or UMTS infrastructure. The proposed approach offers solutions to the problems of multi-domain key generation, key distribution, multi-domain public parameter distribution and inter-domain key agreement.