Cryptanalysis of a New Efficient MAKEP for Wireless Communications

In 2001, Wong and Chan proposed two mutual authentication and key exchange protocols (MAKEP) for low power wireless communications, which were suitable for establishing secure communications between a low-power wireless device and a powerful base station. Unfortunately, Shim pointed out Wong and Chan’s schemes were incurred the unknown key-shared attack, then he proposed an improved scheme to overcome this weakness. Later, Jan and Chen found that the improved scheme was vulnerable to the man-in-the-middle attack. Then, they also proposed a new efficient MAKEP in spirit of Girault’s method to withstand the above weakness. However, in this paper, we shall show that Jan and Chen’s scheme suffered from the forgery attack and the man-inthe-middle attack.