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- W1523719601 abstract "This paper introduces weaknesses of two robust Mix-nets proposed in [10] and [7]. First, we show that [10] can lose anonymity in the presence of a malicious user even though all servers are honest. Second, we show that [7] can lose anonymity through the collaboration of a malicious user and the first server. The user can identify the plaintext sent from the targeted user by invoking two mix sessions at the risk of the colluding server receiving an accusation. We also point out that in a certain case, anonymity is violated solely by the user without colluding to any server. Practical repairs are provided for both schemes. Since such flaws are due to their weak security definitions, we present a stronger security definition by regarding a Mix-net as a batch decryption algorithm of a CCA secure public-key encryption scheme.KeywordsMessage Authentication CodeMalicious UserDecryption OracleElGamal EncryptionInteractive Turing MachineThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves." @default.
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- W1523719601 date "2003-01-01" @default.
- W1523719601 modified "2023-09-23" @default.
- W1523719601 title "Flaws in Some Robust Optimistic Mix-Nets" @default.
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- W1523719601 doi "https://doi.org/10.1007/3-540-45067-x_4" @default.
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