Off-Line Password Guessing Attack Sample Clauses

Off-Line Password Guessing Attack. Previous works [27] demonstrated that smart cards could be vulnerable to side channel attack, i.e., A could extract the information stored in the smart card SCi. A chooses an arbitrary password pwi∗, then computes to guess a correct password as follows: RNr∗ HPWi∗ = XPWi ⊕ h(pwi∗ ) = h(pwi∗ ||RNr∗) XS∗i = Ci ⊕ h(IDS||HPWi∗ ) Bi∗ = h(HPWi∗ ⊕ XS∗i ) = verifies Bi∗ ? Bi If they are equal, A finds the correct password. Otherwise, A guesses another pwi∗ and repeats the steps listed above until the correct password is found. In practical applications, people usually choose an easy-to-remember password for convenience, thus passwords could come from a very small dictionary. Therefore, A could find the correct password using a brute-force attack. Even though Xxxxx et al. has claimed that it is secure, once A guesses the password correctly, A can launch various attacks, such as impersonation, stolen verifier and lost smart card attacks. This is due to the fact that the scheme uses only a password to check the validity of users. Therefore, it is crucial to protect password guessing attacks and use various authentication factors to check the validity of users.
Sample 1
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Off-Line Password Guessing Attack. The authors in [14] stated that their protocol is protected against off-line password guessing attack. However, we discover that a malicious attacker can obtains the master secret key of CS after launching the above attack. The details are described as below:
Sample 1

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