Abstract

The rapid development of instant messaging changes the people's communication, collaboration and entertainment manner radically. Unfortunately, the existing instant messaging technology does not provide built-in support for security features. The security problem of instant messaging system has aroused widespread concern in both academia and industry. In this paper, we proposed a new and secure instant messaging system by using identity-based cryptosystems, which can provide strong authentication and secure communication (confidentiality, integrity and non-repudiation) for both instant messaging client to instant messaging server and instant messaging client to instant messaging client. The proposed instant messaging system is simpler and more efficient than those of existing instant messaging systems.

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