Attack in Shen and Sample Clauses

Attack in Shen and. Du’s Scheme. As shown in FIGURE 1, the login and verifi- cation phase in Shen and Du’s scheme[28], after verifying the validity of the current time of the server TS, user’s smart card further checks if H(H(D H(H(pwi∗) s) Enew) TS), equals to the received M2, Here, D and s can be extracted from the smart card by some physical methods[32-33]. Enew, M2, and TS are transmitted in plaintext whichcan be eas- ily intercepted by the adversary. Then the adversary carries out SEG attack by checking ? s i if M = H(H(D ⊕ H(H(pw∗) ⊕ s) ⊕ Enew) ⊕ T ), for each candidate password pw . Thus, Xxxx and Xx’s scheme couldn’t satisfy the secure requirement, resistance of SEG attack without additional session key, of this kind of scheme.
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