1. Attacks on Secure Logging Schemes 2017 FinancialCryptography TamperResistance
    Gunnar Hartung
    [View PDF on fc17.ifca.ai]
    [Show BibTex Citation]

    @inproceedings{Hartung2017AttacksOS,
    title={Attacks on Secure Logging Schemes},
    author={Gunnar Hartung},
    booktitle={Financial Cryptography},
    year={2017}
    }

We present four attacks on three cryptographic schemes in-tended for securing log files against illicit retroactive modification. Our first two attacks regard the LogFAS scheme by Yavuz et al. (FinancialCryptography 2012), whereas our third and fourth attacks break the BM-and AR-FssAgg schemes by Ma (AsiaCCS 2008).All schemes have an accompanying security proof, seemingly contradicting the existence of attacks. We point out flaws in these proofs, resolvingthe contradiction.

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