NEC Laboratories Europe
Kurfürsten-Anlage 36
69115 Heidelberg
Germany

phone: (+49) 6221 4342-0 
fax: (+49) 6221 4342-155
Dr. Ghassan Karame





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The documents distributed from this page have been provided as a means to ensure timely dissemination of scholarly and technical work on a non-commercial basis. Copyright and all rights therein are nevertheless maintained by the authors or by other copyright holders, notwithstanding that they have offered their works here electronically. These works may not be reposted without the explicit permission of the copyright holder.

Cloud Security
  • Ghassan Karame, Matthias Neugschwandter, Melek Oenen, Hubert Ritzdorf
    Reconciling Security and Functional Requirements in Multi-tenants Clouds
    In Proceedings of the ACM ASIACCS Workshop on Security in Cloud Computing (ACM ASIACCS-SCC), Abu Dhabi, UAE,  2017 [Preprint | Bibtex].
  • Ghassan Karame, Claudio Soriente, Krzysztov Lichota, Srdjan Capkun
    Securing Cloud Data Under Key Exposure
    In IEEE Transactions on Cloud Computing (IEEE TCC), [Preprint | Bibtex] 2017.
  • Frederik Armknecht, Jens-Matthias Bohli, David Froelicher, Ghassan Karame
    Sharing Proofs of Retrievability Across Tenants
    In Proceedings of the ACM Asia Conference on Computer and Communications Security (ACM ASIACCS), Abu Dhabi, UAE, (Acceptance rate: 20.3%) 2017 [Preprint | Bibtex].
  • Hubert Ritzdorf, Ghassan Karame, Claudio Soriente, Srdjan Capkun
    On Information Leakage in Deduplicated Storage Systems
    In Proceedings of the ACM Cloud Computing Security Workshop  (ACM CCSW),
    Vienna, Austria, co-located with ACM CCS (Acceptance rate: 25%) [Preprint | Bibtex] 2016.
  • Frederik Armknecht, Ludovic Barman, Jens-Matthias Bohli, Ghassan Karame
    Mirror: Enabling Proofs of Data Replication and Retrievability in the Cloud
    In Proceedings of the USENIX Security Symposium (USENIX Security),  2016
    (Acceptance rate: 15.5%) [Preprint | Bibtex] 2016.
  • Frederik Armknecht, Jens-Matthias Bohli, Ghassan Karame, Franck Youssef
    Transparent Data Deduplication in the Cloud
    In Proceedings of the ACM Conference on Computer and Communications Security (ACM CCS), Denver, USA, (Acceptance rate: 19.8%) 2015 [Preprint | Bibtex].
  • Claudio Soriente, Ghassan Karame, Hubert Ritzdorf, Srdjan Marinovic, Srdjan Capkun
    Commune: Shared Ownership in an Agnostic Cloud
    In ACM Symposium on Access Control Models and Technologies (ACM SACMAT), Vienna, Austria
    (Acceptance rate: N.A.) 2015 [Preprint | Bibtex].
  • Frederik Armknecht, Jens-Matthias Bohli, Ghassan Karame, Zongren Liu, Christian Reuter
    Outsourced Proofs of Retrievability
    In Proceedings of the ACM Conference on Computer and Communications Security (ACM CCS), Arizona, USA, 2014. (Acceptance rate: ~19.5%) [Preprint | Bibtex].
  • Jens Mathias Bohli, Dan Dobre, Ghassan Karame, Wenting Li
    PrivLoc: Preventing Location Tracking in Geofencing Services
    In Proceedings of International Conference on Trust & Trustworthy Computing (TRUST), Crete, Greece, 2014, (Acceptance rate:~30%) [Preprint | Bibtex].
  • Ghassan Karame, Aurelien Francillon, Victor Budilivschi, Srdjan Capkun, Vedran Capkun
    Microcomputations as Micropayments in Web-based Services
    In ACM Transactions on Internet Technology (TOIT), 2014 [Preprint | Bibtex].
  • Dan Dobre, Ghassan Karame, Wenting Li, Matthias Majuntke, Neeraj Suri, Marko Vukolic
    PoWerStore: Proofs of Writing for Efficient and Robust Storage
    In Proceedings of the ACM Conference on Computer and Communications Security (CCS), Berlin, Germany, 2013, (Acceptance rate: 19.8%) [Preprint | Bibtex].
    Related technical report:
    CoRR abs/1212.3555, 2012.
  • Boris Danev, Ramya Jayaram Masti, Ghassan Karame, Srdjan Capkun
    Enabling Secure VM-vTPM Migration in Private Clouds
    In Proceedings of the Annual Computer Security Applications Conference (ACSAC), Orlando, Florida, USA, 2011, (Acceptance rate: 18.5%) [PDF | Bibtex].
  • Ghassan Karame, Aurelien Francillon, Srdjan Capkun
    Pay as you Browse: Microcomputations as Micropayments in Web-based Services
    In Proceedings of the International World Wide Web Conference (WWW), Hydrabad. India, 2011, (Acceptance rate: 12.46%) [PDF | Bibtex].
  • Ghassan Karame, Srdjan Capkun
    Low-Cost Client Puzzles based on Modular Exponentiation
    In Proceedings of ESORICS (European Symposium on Research in Computer Security), Athens, Greece, 2010, (Acceptance rate: 20.9%) [PDF | Bibtex].
  • Ghassan Karame, Mario Strasser, Srdjan Capkun
    Secure Remote Execution of Sequential Computations
    In Proceedings of ICICS (International Conference on Information and Communications Security), Beijing, China, 2009, (Acceptance rate: 11.86%) [PDF | Bibtex].

Blockchain Security
  • Wenting Li, Alessandro Sforzin, Sergey Fedorov, Ghassan Karame
    Towards Scalable and Private Industrial Blockchains
    In Proceedings of the ACM ASIACCS Workshop on Blockchain, Cryptocurrencies, and Contracts  (ACM ASIACCS-BCC), (Acceptance rate: ~30%), Abu Dhabi, UAE,  2017 [Preprint | Bibtex].
  • Ghassan Karame
    On the Security and Scalability of Bitcoin's Blockchain
    In Proceedings of the ACM Conference on Computer and Communications Security (tutorial at ACM CCS),
    Vienna, Austria, [Preprint | Bibtex | Slides] 2016.
  • Arthur Gervais, Ghassan Karame, K. Wuest, V. Glykantzis, Hubert, Ritzdorf, Srdjan Capkun
    On the Security and Performance of Proof of Work Blockchain
    In Proceedings of the ACM Conference on Computer and Communications Security (ACM CCS),
    Vienna, Austria, (Acceptance rate: 16.5%) [Preprint | Bibtex | Slides ] 2016
  • Arthur Gervais, Hubert Ritzdorf, Ghassan Karame, Srdjan Capkun
    Tampering with the Delivery of Blocks and Transactions in Bitcoin
    In Proceedings of the ACM Conference on Computer and Communications Security (ACM CCS), Denver, USA, (Acceptance rate: 19.8%) 2015 [Preprint | Bibtex].
  • Frederik Armknecht, Ghassan Karame, Avikarsha Mandal, Franck Youssef, Erik Zenner
    Ripple: Overview and Outlook
    In Proceedings of International Conference on Trust & Trustworthy Computing (TRUST), Crete, Greece, 2015, (Acceptance rate: ~33%) [Preprint | Bibtex].
  • Ghassan Karame, Elli Androulaki, Marc Roeschlin, Arthur Gervais, Srdjan Capkun
    Misbehavior in Bitcoin: A Study of Double-spending and Accountability
    In
    ACM Transactions on Information and System Security (TISSEC), 2015 [Preprint | Bibtex].
  • Arthur Gervais, Ghassan Karame, Damian Gruber, Srdjan Capkun
    On the Privacy Provisions of Bloom Filters in Lightweight Bitcoin Clients
    In Proceedings of the 30th Annual Computer Security Applications Conference (ACM ACSAC), New Orleans, Louisiana, USA, 2014
    (Acceptance rate: ~19.9%) [Preprint | Bibtex].
  • Elli Androulaki, Ghassan Karame
    Hiding Transaction Amounts and Balances in Bitcoin
    In Proceedings of International Conference on Trust & Trustworthy Computing (TRUST), Crete, Greece, 2014, (Acceptance rate: ~30%) [Preprint | Bibtex].
  • Arthur Gervais, Ghassan Karame, Srdjan Capkun, Vedran Capkun
    Is Bitcoin a Decentralized Currency?
    In IEEE Security and Privacy, 2014 [Preprint | Bibtex].
  • Elli Androulaki, Ghassan Karame, Marc Roeschlin, Tobias Scherer, Srdjan Capkun
    Evaluating User Privacy in Bitcoin
    In Proceedings of the International Conference on Financial Cryptography and Data Security, (FC), Okinawa, Japan, 2013, (Acceptance rate: 12.5%, regular papers) [Preprint | Bibtex].
    Related technical report: Cryptology ePrint Archive Report 2012/596, 2012.
  • Ghassan Karame, Elli Androulaki, Srdjan Capkun
    Double-Spending Attacks on Fast Payments in Bitcoin
    In Proceedings of the ACM Conference on Computer and Communications Security (CCS), Chicago, IL, USA, 2012, (Acceptance rate: 18.9%) [Preprint | Bibtex].
    Related technical report: Cryptology ePrint Archive Report 2012/248, 2012.
    Related media reports: ETH Globe, September 2012, "Keine versteckten Zahlungen", ETH Life, September 2012, "Better security for the internet currency Bitcoin"

System Security

  • Tassos Dimitriou, Ghassan Karame
    Enabling Anonymous Authorization and Rewarding in the Smart Grid
    In IEEE Transactions on Dependable and Secure Computing (IEEE TDSC), [Preprint | Bibtex] 2015.
  • Ghassan Karame, Wenting Li
    Secure Erasure and Code Update in Legacy Sensors
    In Proceedings of International Conference on Trust & Trustworthy Computing (TRUST), Crete, Greece, 2015, (Acceptance rate: ~33%) [Preprint | Bibtex].
  • Tassos Dimitriou, Ghassan Karame
    Privacy-Friendly Planning of Energy Distribution in Smart Grids
    In Proceedings of the 2nd Smart Energy Security Workshop (ACM SEGS) co-located with ACM CCS 2014, Arizona, USA,
    (Acceptance rate: N.A.) [PDF | Bibtex].
  • Tassos Dimitriou, Ghassan Karame
    Privacy-Friendly Tasking and Trading of Energy in Smart Grids
    In Proceedings of the ACM Symposium on Applied Computing (SAC), Coimbra, Portugal, 2013, (Acceptance rate: 25%) [PDF | Bibtex].
  • Ghassan Karame, Srdjan Capkun, Ueli Maurer
    Privacy-Preserving Outsourcing of Brute-Force Key Searches
    In Proceedings of the ACM Cloud Computing Security Workshop (CCSW); in conjunction with ACM CCS, Chicago, IL, USA, 2011, (Acceptance rate: 28.88%) [PDF | Bibtex].
  • Srdjan Capkun, Mario Cagalj, Ghassan Karame, Nils Ole Tippenhauer
    Integrity Regions: Authentication Through Presence in Wireless Networks
    IEEE Transactions on Mobile Computing (TMC), 2010. [PDF | Bibtex].
  • Ghassan Karame, Mario Cagalj, Srdjan Capkun
    Small Coalitions: Lightweight Collaboration for Efficient P2P Downloads
    In Proceedings of the IEEE International Symposium on Network Computing and Applications (NCA), Cambridge, MA, USA, 2009, (Acceptance rate: N.A.) [PDF | Bibtex].

SDN/Network Security
  • Dimitris Gkounis, Felix Klaedtke, Roberto Bifulco, Ghassan Karame
    Cases for Including a Reference Monitor to SDN
    In Proceedings of the ACM SIGCOMM, (demo)  2016 (to appear) [Preprint | Bibtex] 2016.
  • Heng Cui, Ghassan Karame, Felix Klaedtke, Roberto Bifulco
    On the Fingerprinting of Software-defined Networks
    In IEEE Transactions on Information Forensics & Security (IEEE TIFS),  [Preprint | Bibtex] 2015.
  • Roberto Bifulco, Heng CUI, Ghassan Karame, Felix Klaedtke
    Fingerprinting Software-defined Networks
    In Proceedings of ICNP Workhops (CoolSDN), San Francisco, CA, USA (Acceptance rate: N.A.) 2015 [Slides | Bibtex].
  • Felix Klaedtke, Ghassan Karame, Roberto Bifulco, Heng Cui
    Towards an Access Control Scheme for Accessing Flows in SDN
    In
    IEEE Workshop on Security Issues in SDN  (IEEE SEC-SDN), London, UK, (Acceptance rate: N.A.) 2015 [PDF | Bibtex].
  • Felix Klaedtke, Ghassan Karame, Roberto Bifulco, Heng Cui
    Access Control for SDN Controllers
    A short version of this paper appears in Proceedings of the ACM SIGCOMM Workshop on Hot Topics in Software Defined Networking (HotSDN), Chicago, IL, USA, 2014, (Acceptance rate: N.A.) [PDF | Bibtex].
  • Roberto Bifulco, Ghassan Karame
    Towards a Richer Set of Services in Software-Defined Networks
    In Proceedings of the NDSS Workshop on Security of Emerging Networking Technologies (SENT), San Diego, California, USA, 2014 (Acceptance rate: N.A.) [PDF | Bibtex].
  • Ghassan Karame
    Towards Trustworthy Network Measurements
    In Proceedings of International Conference on Trust & Trustworthy Computing (TRUST), London, UK, 2013, (Acceptance rate: ~20% for regular papers) [Preprint | Bibtex].
  • Ghassan Karame, Boris Danev, Cyrill Bannwart, Srdjan Capkun
    On the Security of End-to-End Measurements based on Packet-Pair Dispersions
    In IEEE Transactions on Information Forensics & Security (TIFS), 2013. [PDF | Bibtex].
  • Ghassan Karame, David Gubler and Srdjan Capkun
    On the Security of Bottleneck Bandwidth Estimation Techniques
    In the Proceedings of SecureComm (International Conference on Security and Privacy in Communication Networks), Athens, Greece, 2009, (Acceptance rate: 25.3%, regular papers) [PDF | Bibtex].
  • Ghassan Karame and Srdjan Capkun
    Towards Secure End-to-End Network Measurements
    ETH Zurich, D-INFK, Technical Report No. 628, June 2009. [PDF | Bibtex].

Security in Reputation Systems
  • Ghassan Karame, Ioannis Christou, Tassos Dimitriou
    A Secure Hybrid Reputation Management System for Super-Peer Networks
    In the Proceedings of IEEE CCNC 2008, Las Vegas, Nevada, USA, (Acceptance rate~ 32%) [PDF | Bibtex].
  • Tassos Dimitriou, Ghassan Karame and Ioannis Christou
    SuperTrust – A Secure and Efficient Framework for Handling Trust in Super Peer Networks
    A short version of this paper can be found in the Proceedings of ACM PODC 2007, Portland, OR, USA, (Acceptance rate: 15.68%) [PDF | Bibtex].
    Full version is in the Proceedings of ICDCN 2008, (Acceptance rate: 16.2%).

Face Detection and Tracking
  • Ghassan Karame, Andreas Stergiou, Nikos Katsarakis, Panagiotis Papageorgiou and Aristodemos Pnevmatikakis
    2D and 3D Face Localization for Complex Scenes
    In the Proceedings of IEEE AVSS 2007, London, UK, (Acceptance rate: N.A.) [PDF | Bibtex].
  • Andreas Stergiou, Ghassan Karame, Aristodemos Pnevmatikakis and Lazaros Polymenakos
    The AIT 2D Face Detection and Tracking System for CLEAR 2007
    In the Proceedings of CLEAR 2007, R. Stiefelhagen and J. Garofolo (eds.), Lecture Notes in Computer Science, 2007, (Acceptance rate: N.A.).
  • Andreas Stergiou, Ghassan Karame, Aristodemos Pnevmatikakis and Lazaros Polymenakos
    The AIT Face Tracker for VACE Multisite Meeting Recordings
    In the Proceedings of CLEAR 2007, R. Stiefelhagen and J. Garofolo (eds.), Lecture Notes in Computer Science, 2007, (Acceptance rate: N.A.).

Miscellaneous
  • N. Dimakis, G. Gkekas, G. Karame, T. Karachristos, S. Tsoladikis, J. Soldatos and L. Polymenakos
    Facilitating Human-Centric Service Delivery Using a Pluggable Service Development Framework
    In the International Journal of Ad Hoc and Ubiquitous Computing, 2009. [Bibtex].
  • Bernard Ghanem, Ali Fawaz, and Ghassan Karame
    Real-Time Vision-Based Mobile Robot Navigation in Outdoor Environments
    In Proceedings of the 4th annual AUB Student Conference, Beirut, Lebanon, 2005 [Best Paper Award], (Acceptance rate: N.A.).
 

(C) 2017 Ghassan Karame