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@Inproceedings { 2020_matzutt_anonboot,
   title = {Utilizing Public Blockchains for the Sybil-Resistant Bootstrapping of Distributed Anonymity Services},
   year = {2020},
   month = {10},
   day = {7},
   pages = {531-542},
   abstract = {Distributed anonymity services, such as onion routing networks or cryptocurrency tumblers, promise privacy protection without trusted third parties. While the security of these services is often well-researched, security implications of their required bootstrapping processes are usually neglected: Users either jointly conduct the anonymization themselves, or they need to rely on a set of non-colluding privacy peers. However, the typically small number of privacy peers enable single adversaries to mimic distributed services. We thus present AnonBoot, a Sybil-resistant medium to securely bootstrap distributed anonymity services via public blockchains. AnonBoot enforces that peers periodically create a small proof of work to refresh their eligibility for providing secure anonymity services. A pseudo-random, locally replicable bootstrapping process using on-chain entropy then prevents biasing the election of eligible peers. Our evaluation using Bitcoin as AnonBoot's underlying blockchain shows its feasibility to maintain a trustworthy repository of 1000 peers with only a small storage footprint while supporting arbitrarily large user bases on top of most blockchains.},
   keywords = {anonymization; bootstrapping; public blockchain; Sybil attack; anonymity network; cryptocurrency tumbler; Bitcoin; Tor},
   tags = {impact_digital; digital_campus},
   url = {https://www.comsys.rwth-aachen.de/fileadmin/papers/2020/2020-matzutt-anonboot.pdf},
   publisher = {ACM},
   booktitle = {Proceedings of the 15th ACM ASIA Conference on Computer and Communications Security (ASIACCS '20), October 5-9, 2020, Taipei, Taiwan},
   event_place = {Taipei, Taiwan},
   event_name = {ASIACCS 2020},
   event_date = {October 5-9, 2020},
   ISBN = {978-1-4503-6750-9/20/10},
   DOI = {10.1145/3320269.3384729},
   reviewed = {1},
   author = {Matzutt, Roman and Pennekamp, Jan and Buchholz, Erik and Wehrle, Klaus}
}

@Inproceedings { 2020_pennekamp_supply_chain_sensing,
   title = {Secure End-to-End Sensing in Supply Chains},
   year = {2020},
   month = {7},
   day = {1},
   abstract = {Trust along digitalized supply chains is challenged by the aspect that monitoring equipment may not be trustworthy or unreliable as respective measurements originate from potentially untrusted parties. To allow for dynamic relationships along supply chains, we propose a blockchain-backed supply chain monitoring architecture relying on trusted hardware. Our design provides a notion of secure end-to-end sensing of interactions even when originating from untrusted surroundings. Due to attested checkpointing, we can identify misinformation early on and reliably pinpoint the origin. A blockchain enables long-term verifiability for all (now trustworthy) IoT data within our system even if issues are detected only after the fact. Our feasibility study and cost analysis further show that our design is indeed deployable in and applicable to today's supply chain settings.},
   keywords = {supply chain; trusted computing; trusted execution; blockchain; Internet of Production; condition monitoring},
   tags = {internet-of-production},
   url = {https://comsys.rwth-aachen.de/fileadmin/papers/2020/2020-pennekamp-supply-chain-sensing.pdf},
   publisher = {IEEE},
   booktitle = {Proceedings of the 5th International Workshop on Cyber-Physical Systems Security (CPS-Sec '20), co-located with the 8th IEEE Conference on Communications and Network Security (CNS '20), June 29-July 1, 2020, Avignon, France},
   event_place = {Avignon, France},
   event_date = {June 29-July 1, 2020},
   ISBN = {978-1-7281-4760-4},
   DOI = {10.1109/CNS48642.2020.9162337},
   reviewed = {1},
   author = {Pennekamp, Jan and Alder, Fritz and Matzutt, Roman and M{\"u}hlberg, Jan Tobias and Piessens, Frank and Wehrle, Klaus}
}

@Inproceedings { 2020_matzutt_coinprune,
   title = {How to Securely Prune Bitcoin’s Blockchain},
   year = {2020},
   month = {6},
   day = {24},
   pages = {298-306},
   abstract = {Bitcoin was the first successful decentralized cryptocurrency and remains the most popular of its kind to this day. Despite the benefits of its blockchain, Bitcoin still faces serious scalability issues, most importantly its ever-increasing blockchain size. While alternative designs introduced schemes to periodically create snapshots and thereafter prune older blocks, already-deployed systems such as Bitcoin are often considered incapable of adopting corresponding approaches. In this work, we revise this popular belief and present CoinPrune, a snapshot-based pruning scheme that is fully compatible with Bitcoin. CoinPrune can be deployed through an opt-in velvet fork, i.e., without impeding the established Bitcoin network. By requiring miners to publicly announce and jointly reaffirm recent snapshots on the blockchain, CoinPrune establishes trust into the snapshots' correctness even in the presence of powerful adversaries. Our evaluation shows that CoinPrune reduces the storage requirements of Bitcoin already by two orders of magnitude today, with further relative savings as the blockchain grows. In our experiments, nodes only have to fetch and process 5 GiB instead of 230 GiB of data when joining the network, reducing the synchronization time on powerful devices from currently 5 h to 46 min, with even more savings for less powerful devices.},
   keywords = {blockchain; block pruning; synchronization; bootstrapping; scalability; velvet fork; Bitcoin},
   tags = {mynedata; impact_digital; digital_campus},
   url = {https://comsys.rwth-aachen.de/fileadmin/papers/2020/2020-matzutt-coinprune.pdf},
   web_url = {https://coinprune.comsys.rwth-aachen.de},
   publisher = {IEEE},
   booktitle = {Proceedings of the 19th IFIP Networking 2020 Conference (NETWORKING '20), June 22-26, 2020, Paris, France},
   event_place = {Paris, France},
   event_name = {NETWORKING 2020},
   event_date = {June 22-26, 2020},
   ISBN = {978-3-903176-28-7},
   reviewed = {1},
   author = {Matzutt, Roman and Kalde, Benedikt and Pennekamp, Jan and Drichel, Arthur and Henze, Martin and Wehrle, Klaus}
}

@Inproceedings { 2020_pennekamp_supply_chain_accountability,
   title = {Private Multi-Hop Accountability for Supply Chains},
   year = {2020},
   month = {6},
   day = {7},
   abstract = {Today's supply chains are becoming increasingly flexible in nature. While adaptability is vastly increased, these more dynamic associations necessitate more extensive data sharing among different stakeholders while simultaneously overturning previously established levels of trust. Hence, manufacturers' demand to track goods and to investigate root causes of issues across their supply chains becomes more challenging to satisfy within these now untrusted environments. Complementarily, suppliers need to keep any data irrelevant to such routine checks secret to remain competitive. To bridge the needs of contractors and suppliers in increasingly flexible supply chains, we thus propose to establish a privacy-preserving and distributed multi-hop accountability log among the involved stakeholders based on Attribute-based Encryption and backed by a blockchain. Our large-scale feasibility study is motivated by a real-world manufacturing process, i.e., a fine blanking line, and reveals only modest costs for multi-hop tracing and tracking of goods.},
   keywords = {supply chain; multi-hop tracking and tracing; blockchain; attribute-based encryption; Internet of Production},
   tags = {internet-of-production},
   url = {https://comsys.rwth-aachen.de/fileadmin/papers/2020/2020-pennekamp-supply-chain-privacy.pdf},
   publisher = {IEEE},
   booktitle = {Proceedings of the 2020 IEEE International Conference on Communications Workshops (ICC Workshops '20), 1st Workshop on Blockchain for IoT and Cyber-Physical Systems (BIoTCPS '20), June 7-11, 2020, Dublin, Ireland},
   event_place = {Dublin, Ireland},
   event_date = {June 7-11, 2020},
   ISBN = {978-1-7281-7440-2},
   ISSN = {2474-9133},
   DOI = {10.1109/ICCWorkshops49005.2020.9145100},
   reviewed = {1},
   author = {Pennekamp, Jan and Bader, Lennart and Matzutt, Roman and Niemietz, Philipp and Trauth, Daniel and Henze, Martin and Bergs, Thomas and Wehrle, Klaus}
}

@Inproceedings { 2020_matzutt_coralis,
   title = {A Secure and Practical Decentralized Ecosystem for Shareable Education Material},
   year = {2020},
   month = {1},
   day = {7},
   pages = {529-534},
   abstract = {Traditionally, the university landscape is highly federated, which hinders potentials for coordinated collaborations. While the lack of a strict hierarchy on the inter-university level is critical for ensuring free research and higher education, this concurrency limits the access to high-quality education materials. Especially regarding resources such as lecture notes or exercise tasks we observe a high susceptibility to redundant work and lacking quality assessment of material created in isolation by individual university institutes. To remedy this situation, in this paper we propose CORALIS, a decentralized marketplace for offering, acquiring, discussing, and improving education resources across university borders. Our design is based on a permissioned blockchain to (a) realize accountable access control via simple on-chain license terms, (b) trace the evolution of encrypted containers accumulating bundles of shareable education resources, and (c) record user comments and ratings for further improving the quality of offered education material.},
   keywords = {blockchain platform; permissioned blockchain; education material; quality assessment; collaborative work},
   tags = {impact_digital},
   url = {https://comsys.rwth-aachen.de/fileadmin/papers/2020/2020-matzutt-coralis.pdf},
   publisher = {IEEE},
   booktitle = {Proceedings of the 34th International Conference on Information Networking (ICOIN '20), January 7-10, 2020, Barcelona, Spain},
   event_place = {Barcelona, Spain},
   event_date = {January 7-10, 2020},
   ISBN = {978-1-7281-4199-2},
   DOI = {10.1109/ICOIN48656.2020.9016478},
   reviewed = {1},
   author = {Matzutt, Roman and Pennekamp, Jan and Wehrle, Klaus}
}