Floragasse 7 – 5th floor, 1040 Vienna

Aljosha Judmayer

Aljosha Judmayer

is researcher at SBA Research and occasionally consultant, as well as lecturer at TU Wien.

  • ajudmayer@sba-research.org
  • +43 (1) 505 36 88
  • 4016 59DB D4E0 A908 FCDF 7BFB A40D 40AC E687 AADD
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    =S+20
    -----END PGP PUBLIC KEY BLOCK-----

Research Interests

Aljosha’s research focuses on the security and resilience aspects of decentralized systems, network security and systems security – with an emphasis on cryptocurrencies, their underlying technologies and consensus mechanisms.


Bio

Aljosha received a MSc in Software Engineering & Internet Computing from TU Wien and is an experienced senior IT security consultant. Currently he is working towards his PhD degree on foundations and applications of distributed ledger technologies at TU Wien.


Publications

Top Publications:

  • On the security of security extensions for IP-based KNX networks (2014)
    • INPROCEEDINGS--
    • Aljosha Judmayer and Lukas Krammer and Wolfgang Kastner
    • 10th IEEE International Workshop on Factory Communication Systems
    @INPROCEEDINGS{Judmayer2014security,
       author = {Aljosha Judmayer and Lukas Krammer and Wolfgang Kastner},
       title = {On the security of security extensions for IP-based KNX networks},
       booktitle = {10th IEEE International Workshop on Factory Communication Systems},
       year = {2014},
       month = {5},
       pdf = {judmayer_KNX_wfcs2014.pdf},
    }
  • Condensed Cryptographic Currencies Crash Course (C5) (2016)
    • INPROCEEDINGS-true
    • Aljosha Judmayer and Edgar R. Weippl
    • 2016 {ACM} {SIGSAC} Conference on Computer and Communications Security
    @INPROCEEDINGS{Judmayer2016Condensed,
       author = {Aljosha Judmayer and {Edgar R.} Weippl},
       authorhotlist = {true},
       title = {Condensed Cryptographic Currencies Crash Course (C5)},
       booktitle = {2016 {ACM} {SIGSAC} Conference on Computer and Communications Security},
       year = {2016},
       month = {10},
       pdf = {http://dl.acm.org/citation.cfm?id=2976754},
    }
  • Cryptographic Currencies Crash Course (C4): Tutorial (2016)
    • INPROCEEDINGS-true
    • Aljosha Judmayer and Edgar R. Weippl
    • 25th International Conference on World Wide Web (WWW 2016)
    @INPROCEEDINGS{Judmayer2016Cryptographic,
       author = {Aljosha Judmayer and {Edgar R.} Weippl},
       authorhotlist = {true},
       title = {Cryptographic Currencies Crash Course (C4): Tutorial},
       booktitle = {25th International Conference on World Wide Web (WWW 2016)},
       year = {2016},
       month = {4},
       pdf = {http://www2016.net/proceedings/companion/p1021.pdf},
    }
  • Blocks and Chains: Introduction to Bitcoin, Cryptocurrencies, and Their Consensus Mechanisms (2017)
    • ARTICLE--
    • Aljosha Judmayer and Nicholas Stifter and Katharina Krombholz and Edgar R. Weippl
    • Synthesis Lectures on Information Security, Privacy, and Trust
    @ARTICLE{Judmayer2017Blocks,
       author = {Aljosha Judmayer and Nicholas Stifter and Katharina Krombholz and {Edgar R.} Weippl},
       title = {Blocks and Chains: Introduction to Bitcoin,
       Cryptocurrencies,
       and Their Consensus Mechanisms},
       journal = {Synthesis Lectures on Information Security,
       Privacy,
       and Trust},
       year = {2017},
       pdf = {https://doi.org/10.2200/S00773ED1V01Y201704SPT020},
    }
  • Lightweight Address Hopping for Defending the IPv6 IoT (2017)
    • INPROCEEDINGS--
    • Aljosha Judmayer and Johanna Ullrich and Georg Merzdovnik and Artemios G. Voyiatzis and Edgar R. Weippl
    • 12th International Conference on Availability, Reliability and Security (ARES)
    @INPROCEEDINGS{Judmayer2017Lightweight,
       author = {Aljosha Judmayer and Johanna Ullrich and Georg Merzdovnik and {Artemios G.} Voyiatzis and {Edgar R.} Weippl},
       title = {Lightweight Address Hopping for Defending the IPv6 IoT},
       booktitle = {12th International Conference on Availability,
       Reliability and Security (ARES)},
       year = {2017},
       month = {9},
       pdf = {201707 - JUDMAYER - LightweightAddressHopping.pdf},
    }
  • Merged Mining: Curse or Cure? (2017)
    • INPROCEEDINGS-true
    • Aljosha Judmayer and Alexei Zamyatin and Nicholas Stifter and Artemios G. Voyiatzis and Edgar R. Weippl
    • International Workshop on Cryptocurrencies and Blockchain Technology (CBT 17)
    @INPROCEEDINGS{Judmayer2017Merged,
       author = {Aljosha Judmayer and Alexei Zamyatin and Nicholas Stifter and {Artemios G.} Voyiatzis and {Edgar R.} Weippl},
       authorhotlist = {true},
       title = {Merged Mining: Curse or Cure?},
       booktitle = {International Workshop on Cryptocurrencies and Blockchain Technology (CBT 17)},
       year = {2017},
       month = {9},
       pdf = {201709 - AJudmayer - CBT_Merged_Mining_camera_ready_final.pdf},
    }
  • Pitchforks in Cryptocurrencies: Enforcing rule changes through offensive forking- and consensus techniques (Short Paper) (2018)
    • INPROCEEDINGS--
    • Aljosha Judmayer and Nicholas Stifter and Philipp Schindler and Edgar R. Weippl
    • International Workshop on Cryptocurrencies and Blockchain Technology (CBT 2018)
    @INPROCEEDINGS{Judmayer2018Pitchforks,
       author = {Aljosha Judmayer and Nicholas Stifter and Philipp Schindler and {Edgar R.} Weippl},
       title = {Pitchforks in Cryptocurrencies: Enforcing rule changes through offensive forking- and consensus techniques (Short Paper)},
       booktitle = {International Workshop on Cryptocurrencies and Blockchain Technology (CBT 2018)},
       year = {2018},
       month = {9},
       pdf = {201809 - AJudmayer - Pitchfork_2018-09-05.pdf},
    }
  • Für bare Münze? NutzerInnenerfahrungen mit Sicherheit und Datenschutz bei Bitcoin (2016)
    • INPROCEEDINGS--
    • Katharina Krombholz and Aljosha Judmayer and Matthias Gusenbauer and Edgar R. Weippl
    • Sicherheit 2016: Sicherheit, Schutz und Zuverlässigkeit, Beiträge der 8. Jahrestagung des Fachbereichs Sicherheit der Gesellschaft für Informatik e.V.
    @INPROCEEDINGS{Krombholz2016bare,
       author = {Katharina Krombholz and Aljosha Judmayer and Matthias Gusenbauer and {Edgar R.} Weippl},
       title = {Für bare Münze? NutzerInnenerfahrungen mit Sicherheit und Datenschutz bei Bitcoin},
       booktitle = {Sicherheit 2016: Sicherheit,
       Schutz und Zuverlässigkeit,
       Beiträge der 8. Jahrestagung des Fachbereichs Sicherheit der Gesellschaft für Informatik e.V.},
       year = {2016},
       month = {4},
    }
  • The Other Side of the Coin: User Experiences with Bitcoin Security and Privacy (2016)
    • INPROCEEDINGS-true
    • Katharina Krombholz and Aljosha Judmayer and Matthias Gusenbauer and Edgar R. Weippl
    • International Conference on Financial Cryptography and Data Security (FC)
    @INPROCEEDINGS{Krombholz2016Other,
       author = {Katharina Krombholz and Aljosha Judmayer and Matthias Gusenbauer and {Edgar R.} Weippl},
       authorhotlist = {true},
       title = {The Other Side of the Coin: User Experiences with Bitcoin Security and Privacy},
       booktitle = {International Conference on Financial Cryptography and Data Security (FC)},
       year = {2016},
       month = {2},
       pdf = {TheOtherSideOfTheCoin_FC16preConf.pdf},
    }
  • A performance assessment of network address shuffling in IoT systems (2017)
    • INPROCEEDINGS--
    • Georg Merzdovnik and Aljosha Judmayer and Artemios G. Voyiatzis and Edgar R. Weippl
    • 16th International Conference on Computer Aided Systems Theory (EUROCAST 2017)
    @INPROCEEDINGS{Merzdovnik2017performance,
       author = {Georg Merzdovnik and Aljosha Judmayer and {Artemios G.} Voyiatzis and {Edgar R.} Weippl},
       title = {A performance assessment of network address shuffling in IoT systems},
       booktitle = {16th International Conference on Computer Aided Systems Theory (EUROCAST 2017)},
       year = {2017},
       month = {2},
       pdf = {http://eurocast2017.fulp.ulpgc.es/sites/default/files/Eurocast_2017_Extended_Abstract_Book.pdf},
    }
  • A Deep Dive into Bitcoin Mining Pools: An Empirical Analysis of Mining Shares (2019)
    • INPROCEEDINGS--
    • Matteo Romiti and Aljosha Judmayer and Alexei Zamyatin and Bernhard Haslhofer
    • 2019 Workshop on the Economics of Information Security
    @INPROCEEDINGS{Romiti2019Deep,
       author = {Matteo Romiti and Aljosha Judmayer and Alexei Zamyatin and Bernhard Haslhofer},
       title = {A Deep Dive into Bitcoin Mining Pools: An Empirical Analysis of Mining Shares},
       booktitle = {2019 Workshop on the Economics of Information Security},
       year = {2019},
       month = {6},
       pdf = {https://weis2019.econinfosec.org/wp-content/uploads/sites/6/2019/05/WEIS_2019_paper_30.pdf},
    }
  • HydRand: Practical Continuous Distributed Randomness (2020)
    • INPROCEEDINGStruetrue
    • Philipp Schindler and Aljosha Judmayer and Nicholas Stifter and Edgar R. Weippl
    • 2020 IEEE Symposium on Security and Privacy (SP)
    @INPROCEEDINGS{Schindler2020HydRand,
       author = {Philipp Schindler and Aljosha Judmayer and Nicholas Stifter and {Edgar R.} Weippl},
       authorhotlist = {true},
       sbahotlist = {true},
       title = {HydRand: Practical Continuous Distributed Randomness},
       booktitle = {2020 IEEE Symposium on Security and Privacy (SP)},
       year = {2020},
       month = {5},
       pdf = {https://eprint.iacr.org/2018/319.pdf},
    }
  • Echoes of the Past: Recovering Blockchain Metrics from Merged Mining (2019)
    • INPROCEEDINGS--
    • Nicholas Stifter and Philipp Schindler and Aljosha Judmayer and Alexei Zamyatin and Andreas Kern and Edgar R. Weippl
    • Financial Cryptography and Data Security 2019
    @INPROCEEDINGS{Stifter2019Echoes,
       author = {Nicholas Stifter and Philipp Schindler and Aljosha Judmayer and Alexei Zamyatin and Andreas Kern and {Edgar R.} Weippl},
       title = {Echoes of the Past: Recovering Blockchain Metrics from Merged Mining},
       booktitle = {Financial Cryptography and Data Security 2019},
       year = {2019},
       month = {2},
       pdf = {https://eprint.iacr.org/2018/1134.pdf},
    }
  • Revisiting Practical Byzantine Fault Tolerance Through Blockchain Technologies (2019)
    • INBOOK--
    • Nicholas Stifter and Aljosha Judmayer and Edgar R. Weippl
    @INBOOK{Stifter2019Revisiting,
       author = {Nicholas Stifter and Aljosha Judmayer and {Edgar R.} Weippl},
       title = {Revisiting Practical Byzantine Fault Tolerance Through Blockchain Technologies},
       booktitle = {Security and Quality in Cyber-Physical Systems Engineering},
       year = {2019},
       pdf = {https://link.springer.com/book/10.1007/978-3-030-25312-7},
    }
  • Proof-of-Blackouts? How Proof-of-Work Cryptocurrencies Could Affect Power Grids (2018)
    • INPROCEEDINGStruetrue
    • Johanna Ullrich and Nicholas Stifter and Aljosha Judmayer and Adrian Dabrowski and Edgar R. Weippl
    • International Symposium on Research in Attacks, Intrusions and Defenses (RAID)
    @INPROCEEDINGS{Ullrich2018ProofofBlackouts,
       author = {Johanna Ullrich and Nicholas Stifter and Aljosha Judmayer and Adrian Dabrowski and {Edgar R.} Weippl},
       authorhotlist = {true},
       sbahotlist = {true},
       title = {Proof-of-Blackouts? How Proof-of-Work Cryptocurrencies Could Affect Power Grids},
       booktitle = {International Symposium on Research in Attacks,
       Intrusions and Defenses (RAID)},
       year = {2018},
       month = {9},
       pdf = {https://www.sqi.at/resources/RAID2018.pdf},
    }
  • (Short Paper) A Wild Velvet Fork Appears! Inclusive Blockchain Protocol Changes in Practice (2018)
    • INPROCEEDINGS--
    • Alexei Zamyatin and Nicholas Stifter and Aljosha Judmayer and Philipp Schindler and Edgar R. Weippl and W.J. Knottenbelt
    • 5th Workshop on Bitcoin and Blockchain Research, Financial Cryptography and Data Security 2018
    @INPROCEEDINGS{Zamyatin2018Short,
       author = {Alexei Zamyatin and Nicholas Stifter and Aljosha Judmayer and Philipp Schindler and {Edgar R.} Weippl and {W.J.} Knottenbelt},
       title = {(Short Paper) A Wild Velvet Fork Appears! Inclusive Blockchain Protocol Changes in Practice},
       booktitle = {5th Workshop on Bitcoin and Blockchain Research,
       Financial Cryptography and Data Security 2018},
       year = {2018},
       month = {2},
       pdf = {https://eprint.iacr.org/2018/087.pdf},
    }

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