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- Instant Messaging (or IM for short) is becoming one of the most popular applications on the Internet. Individuals can communicate instantly through a user-friendly graphical user interface over fixed and wireless devices. However, several security issues occur, majorly privacy and authentication. A number of secure IM protocols have been proposed, but they still lack of necessary security properties and acceptable performance. In this paper, we introduce a new secure instant messaging protocol that not only satisfies necessary security properties. Moreover, our analysis shows that the proposed protocol has better transaction performance than existing protocols.
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