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I think that this notation "$(A,N_X,T_B),K_{BS}$" isn't correct and must be transcripted as "$(A,N_X,T_B).K_{BS}$", which could be interpreted as the resulting cipherText of "$(A,N_X,T_B)$ under the Key $K_{BS}$". Under these conditions, we could try to understand that the attacker X begin by impersonating A, by sending to B the plainText $(A,N_X)$ X: ...


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Just to say you have tons of literature about that. If you need an entry point check out some papers here for instance: http://esorics2014.pwr.wroc.pl/page2/index.html#15 Read the introductions and the related work and follow the links to find the big seminal papers in the domain. Oh also, just a remark: it seems that you are looking for anonymity. if ...


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It can guarantee the integrity, because you can not fake another voting with the same hash. However, this only shows the ballot is casted correctly, but does not prove the ballot is correctly counted. And as you said, it can not provide anonymity, such as buying vote and coercion.


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Not much in the cryptographic protocols themselves. But you can do other things to get around such attacks: Request signed read receipts, or received receipts. So, if I send a message from my phone to yours, it sends back a reply that your phone has received the message (or that you have opened it). If such a receipt is signed, your attacker might be able ...


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Message sequencing AND hash-tabling for a trail of backward messages. The loss of a single message is not a disaster, actually. To be not over-paranoid, implement "resend request" in your protocol. If it works and hashes are matched - it can be just a communication error. But if it fails - a line should be dropped immediately. Try to use Tor by the way, and ...


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Assuming that your question excludes any kind of “regular” transmission error (which might also lead to one of the messages not reaching the receiver) the receiver should regard message #236 to be potentially malicious since the “ticket” (what you call “sequence number”) for message #236 can not be verified as genuine. The specific reaction to such a ...



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