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@Article { 2023_pennekamp_purchase_inquiries,
   title = {Offering Two-Way Privacy for Evolved Purchase Inquiries},
   journal = {ACM Transactions on Internet Technology},
   year = {2023},
   month = {11},
   day = {17},
   volume = {23},
   number = {4},
   abstract = {Dynamic and flexible business relationships are expected to become more important in the future to accommodate specialized change requests or small-batch production. Today, buyers and sellers must disclose sensitive information on products upfront before the actual manufacturing. However, without a trust relation, this situation is precarious for the involved companies as they fear for their competitiveness. Related work overlooks this issue so far: Existing approaches only protect the information of a single party only, hindering dynamic and on-demand business relationships. To account for the corresponding research gap of inadequately privacy-protected information and to deal with companies without an established trust relation, we pursue the direction of innovative privacy-preserving purchase inquiries that seamlessly integrate into today's established supplier management and procurement processes. Utilizing well-established building blocks from private computing, such as private set intersection and homomorphic encryption, we propose two designs with slightly different privacy and performance implications to securely realize purchase inquiries over the Internet. In particular, we allow buyers to consider more potential sellers without sharing sensitive information and relieve sellers of the burden of repeatedly preparing elaborate yet discarded offers. We demonstrate our approaches' scalability using two real-world use cases from the domain of production technology. Overall, we present deployable designs that offer two-way privacy for purchase inquiries and, in turn, fill a gap that currently hinders establishing dynamic and flexible business relationships. In the future, we expect significantly increasing research activity in this overlooked area to address the needs of an evolving production landscape.},
   keywords = {bootstrapping procurement; secure industrial collaboration; private set intersection; homomorphic encryption; Internet of Production},
   tags = {internet-of-production},
   url = {https://www.comsys.rwth-aachen.de/fileadmin/papers/2023/2023-pennekamp-purchase-inquiries.pdf},
   publisher = {ACM},
   ISSN = {1533-5399},
   DOI = {10.1145/3599968},
   reviewed = {1},
   author = {Pennekamp, Jan and Dahlmanns, Markus and Fuhrmann, Frederik and Heutmann, Timo and Kreppein, Alexander and Grunert, Dennis and Lange, Christoph and Schmitt, Robert H. and Wehrle, Klaus}
}

@Inproceedings { 2021_pennekamp_bootstrapping,
   title = {Confidential Computing-Induced Privacy Benefits for the Bootstrapping of New Business Relationships},
   year = {2021},
   month = {11},
   day = {15},
   number = {RWTH-2021-09499},
   abstract = {In addition to quality improvements and cost reductions, dynamic and flexible business relationships are expected to become more important in the future to account for specific customer change requests or small-batch production. Today, despite reservation, sensitive information must be shared upfront between buyers and sellers. However, without a trust relation, this situation is precarious for the involved companies as they fear for their competitiveness following information leaks or breaches of their privacy. To address this issue, the concepts of confidential computing and cloud computing come to mind as they promise to offer scalable approaches that preserve the privacy of participating companies. In particular, designs building on confidential computing can help to technically enforce privacy. Moreover, cloud computing constitutes an elegant design choice to scale these novel protocols to industry needs while limiting the setup and management overhead for practitioners. Thus, novel approaches in this area can advance the status quo of bootstrapping new relationships as they provide privacy-preserving alternatives that are suitable for immediate deployment.},
   keywords = {bootstrapping procurement; business relationships; secure industrial collaboration; privacy; Internet of Production},
   tags = {internet-of-production},
   url = {https://www.comsys.rwth-aachen.de/fileadmin/papers/2021/2021-pennekamp-bootstrapping.pdf},
   publisher = {RWTH Aachen University},
   booktitle = {Blitz Talk at the 2021 Cloud Computing Security Workshop (CCSW '21), co-located with the 28th ACM SIGSAC Conference on Computer and Communications Security (CCS '21), November 15-19, 2021, Seoul, Korea},
   institution = {RWTH Aachen University},
   event_place = {Seoul, Korea},
   event_date = {November 14, 2021},
   DOI = {10.18154/RWTH-2021-09499},
   author = {Pennekamp, Jan and Fuhrmann, Frederik and Dahlmanns, Markus and Heutmann, Timo and Kreppein, Alexander and Grunert, Dennis and Lange, Christoph and Schmitt, Robert H. and Wehrle, Klaus}
}

@Inproceedings { 2019_wagner_dispute_resolution,
   title = {Dispute Resolution for Smart Contract-based Two Party Protocols},
   year = {2019},
   month = {5},
   abstract = {Blockchain systems promise to mediate interactions of mutually distrusting parties without a trusted third party. However, protocols with full smart contract-based security are either limited in functionality or complex, with high costs for secured interactions. This observation leads to the development of protocol-specific schemes to avoid costly dispute resolution in case all participants remain honest. In this paper, we introduce SmartJudge, an extensible generalization of this trend for smart contract-based two-party protocols. SmartJudge relies on a protocol-independent mediator smart contract that moderates two-party interactions and only consults protocol-specific verifier smart contracts in case of a dispute. This way, SmartJudge avoids verification costs in absence of disputes and sustains interaction confidentiality among honest parties. We implement verifier smart contracts for cross-blockchain trades and exchanging digital goods and show that SmartJudge can reduce costs by 46-50\% and 22\% over current state of the art, respectively.},
   keywords = {Ethereum,Bitcoin,smart contracts,two-party protocols,dispute resolution,cross-blockchain trades},
   tags = {mynedata, impact-digital, rfc},
   url = {https://www.comsys.rwth-aachen.de/fileadmin/papers/2019/2019-wagner-dispute.pdf},
   publisher = {IEEE},
   booktitle = {IEEE International Conference on Blockchain and Cryptocurrency 2019 (ICBC 2019)},
   event_place = {Seoul, South Korea},
   event_name = {IEEE International Conference on Blockchain and Cryptocurrency 2019},
   language = {English},
   DOI = {10.1109/BLOC.2019.8751312},
   reviewed = {1},
   author = {Wagner, Eric and V{\"o}lker, Achim and Fuhrmann, Frederik and Matzutt, Roman and Wehrle, Klaus}
}