Adaptive Attack Sample Clauses

Adaptive Attack. ‌ In the static attack, we demonstrated that the claim “for all possibilities for the set P2, if the leader is an honest party in P2, then the protocol terminates with the correct value” is not valid. We provided specific choices of the leader within certain possibilities for P2 where the claim does not hold. This shows that the claim is incorrect in those cases. In the adaptive attack, we further illustrate the difficulty in finding an argument for the weaker claim “there exists a possibility for P2 such that if the leader is an honest party in P2, then the protocol terminates with the correct values.” We use the same setup with four parties, namely p1, p2, p3, and p4, and demonstrate that if either p1 or p2 is chosen as the leader, the adversary can manipulate the protocol to start over instead of terminating. Since any legitimate set P2 consists of three parties, it must include at least one of p1 and p2. Therefore, in any possible set P2, there is an honest party whose selection as the leader does not guarantee termination. This shows the hopelessness of finding a valid argument for the weaker claim. Assuming the preconditions for the Πselect protocol hold, we now consider adaptive corruption in this subsection. The adversary does not corrupt any party before the leader is selected. If the chosen leader is p2, then follows the description of the static attack by corrupting p1 and executing the attack as previously described. However, if party p1 is chosen as the leader, we can leverage symmetry and modify the adver- xxxx’s description accordingly. We rename the parties as follows: p′1 .= p2, p′2 .= p1, p′3 .= p4, and p′4 .= p3. The adversary A corrupts p′1 and runs the same static adversary code on the participant set p1′ , p′2, p′3, p4′ . Furthermore, it is important to note that in the static attack, we previously specified that Relay1,2 = Relay4,2 .= p1, p2, p3 , while allowing Relay2,1 and Relay3,1 to be arbi- trary since they were not essential to the attack and could take any value. However, in order to achieve full symmetry in the static attack and apply the aforementioned approach, should now set Relay2,1 = Relay3,1 .= p1, p2, p4 in the description of the static attack. With these adjustments, our adaptive adversary is complete. B The Asynchronous Xxxxxx-Xxxx Extension‌ Here, we investigate when the generic extension of binary to multi-valued synchronous BA (for t < n/3) given by Xxxxxx and Xxxx [TC84] works in the asynchronous setting with eve...
Sample 1

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