# Research Interest

**While at the University of Luxembourg**, *i.e* between 2007 and 2022, my main research interests used to lie in the security and performance evaluation (including energy efficiency) of parallel and distributed computing platforms, such as HPC clusters or Cloud Computing infrastructures.
In this context, below are listed some recent relevant contributions per domain:

**Performance & Energy efficiency of HPC/Cloud platforms**: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17]**Security of Distributed Systems (incl. blockchains)**: [18] [19] [20] [21] [9] [22] [23] [24] [25]**Crash/cheating fault**analysis/tolerance and**result checking**in grid and distributed computing platforms: [26] [27] [28] [29] [30] [31] [32] [33] [34]**Code Obfuscation**: [35] [36] [37]**Developing security awareness by education**[38] [39] [20] [22] [23] [24] [25]

I also co-authored a couple of **books** (related to NFT, blockchains, coding theory or C programming) – see this page for more details.

### References

- J. C. de la Torre, J. M. Aragó-Jurado, J. Jareño, S. Varrette, and B. Dorronsoro, “
,” in*Obfuscating LLVM Intermediate Representation Source Code with NSGA-II**15th Intl. Conf. on Computational Intelligence in Security for Information Systems (CISIS’22)*, Salamanca (Spain), 2022.

- S. Varrette, H. Cartiaux, S. Peter, E. Kieffer, T. Valette, and A. Olloh, “
,” in*Management of an Academic HPC & Research Computing Facility: The ULHPC Experience 2.0**Proc. of the 6^\textth ACM High Performance Computing and Cluster Technologies Conf. (HPCCT 2022)*, Fuzhou, China, 2022.

- S. Varrette, H. Cartiaux, T. Valette, and A. Olloh, “
,” in*Aggregating and Consolidating two High Performant Network Topologies: The ULHPC Experience**ACM Practice and Experience in Advanced Research Computing (PEARC’22)*, Boston, USA, 2022.

- S. Varrette, E. Kieffer, and F. Pinel, “
,” in*Optimizing the Resource and Job Management System of an Academic HPC and Research Computing Facility**21st IEEE Intl. Symp. on Parallel and Distributed Computing (ISPDC’22)*, Basel, Switzerland, 2022.

- J.-G. Dumas, P. Lafourcade, E. Roudeix, A. Tichit, and S. Varrette,
, 1er ed. Dunod, 2022.*Les NFT en 40 questions: Des réponses claires et détaillées pour comprendre les Non Fungible Tokens*

- J.-G. Dumas, P. Lafourcade, A. Tichit, and S. Varrette,
, 2eme ed. Dunod, 2022.*Les blockchains en 50 questions: comprendre le fonctionnement et les enjeux de cette technologie innovante*

- S. Varrette, E. Kieffer, F. Pinel, E. Krishnasamy, S. Peter, H. Cartiaux, and X. Besseron, “
,” in*RESIF 3.0: Toward a Flexible & Automated Management of User Software Environment on HPC facility**ACM Practice and Experience in Advanced Research Computing (PEARC’21)*, Virtual Event, 2021.

- S. Mahon, S. Varrette, V. Plugaru, F. Pinel, and P. Bouvry, “
,” in*Performance Analysis of Distributed and Scalable Deep Learning**20th IEEE/ACM Intl. Symp. on Cluster, Cloud and Internet Computing (CCGrid’20)*, Melbourne, Australia, 2020, pp. 760–766.

- J.-G. Dumas, P. Lafourcade, A. Tichit, and S. Varrette,
, 1Er(bis). Dunod, 2019.

- J. Emeras, S. Varrette, V. Plugaru, and P. Bouvry, “
,”*Amazon Elastic Compute Cloud (EC2) versus In-House HPC Platform: A Cost Analysis**IEEE Trans. Cloud Computing*, vol. 7, no. 2, pp. 456–468, Apr. 2019.

- A.-C. Orgerie and S. Varrette, “
,” J. Carretero, E. Jeannot, and A. Y. Zomaya, Eds. IET, 2019, pp. 161–176.*Ultrascale Computing Systems*

- S. Varrette, F. Pinel, E. Kieffer, G. Danoy, and P. Bouvry, “
,” in*Automatic Software Tuning of Parallel Programs for Energy-Aware Executions**Proc. of 13th Intl. Conf. on Parallel Processing and Applied Mathematics (PPAM 2019)*, Bialystok, Poland, 2019, vol. 12044.

- J.-G. Dumas, P. Lafourcade, A. Tichit, and S. Varrette,

- J.-G. Dumas, J.-L. Roch, E. Tannier, and S. Varrette,
, 3rd ed. Dunod, 2018.*Théorie des Codes : Compression, Cryptage et Correction*

- A. A. Z. A. Ibrahim, S. Varrette, and P. Bouvry, “
,” in*PRESENCE: Toward a Novel Approach for Performance Evaluation of Mobile Cloud SaaS Web Services**Proc. of the 32nd IEEE Intl. Conf. on Information Networking (ICOIN 2018)*, Chiang Mai, Thailand, 2018, pp. 50–55.

- J. Emeras, S. Varrette, and P. Bouvry, “
,” in*Amazon Elastic Compute Cloud (EC2) vs. in-House HPC Platform: a Cost Analysis**Proc. of the 9th IEEE Intl. Conf. on Cloud Computing (CLOUD 2016)*, San Francisco, USA, 2016.

- J. Muszyński, S. Varrette, and P. Bouvry, “
,” in*Reducing Efficiency of Connectivity-Splitting Attack on Newscast via Limited Gossip**Proc. of the 19th European Event on Bio-Inspired Computation, EvoCOMNET 2016*, Porto, Portugal, 2016, vol. 9597, pp. 299–314.

- J.-G. Dumas, J.-L. Roch, E. Tannier, and S. Varrette,
. Wiley & Sons, 2015.*Foundations of Coding: Compression, Encryption, Error-Correction*

- V. Plugaru, S. Varrette, and P. Bouvry, “
,” in*Performance Analysis of Cloud Environments on Top of Energy-Efficient Platforms Featuring Low Power Processors**Proc. of the 6th IEEE Intl. Conf. on Cloud Computing Technology and Science (CloudCom’14)*, Singapore, 2014, pp. 416–425.

- J. Muszyński, S. Varrette, J. L. J. Laredo, and P. Bouvry, “
,” in*Exploiting the Hard-wired Vulnerabilities of Newscast via Connectivity-splitting Attack**Proc. of the IEEE Intl. Conf. on Network and System Security (NSS 2014)*, Xi’an, China, 2014, vol. 8792, pp. 152–165.

- S. Varrette, V. Plugaru, M. Guzek, X. Besseron, and P. Bouvry, “
,” in*HPC Performance and Energy-Efficiency of the OpenStack Cloud Middleware**Proc. of the 43rd Intl. Conf. on Parallel Processing (ICPP-2014), Heterogeneous and Unconventional Cluster Architectures and Applications Workshop (HUCAA’14)*, Minneapolis, MN, US, 2014, pp. 419–428.

- S. Varrette, M. Guzek, V. Plugaru, X. Besseron, and P. Bouvry, “
,” in*HPC Performance and Energy-Efficiency of Xen, KVM and VMware Hypervisors**Proc. of the 25th Symposium on Computer Architecture and High Performance Computing (SBAC-PAD 2013)*, Porto de Galinhas, Brazil, 2013, pp. 89–96.

- B. Bertholon, S. Varrette, and P. Bouvry, “
,” in*JShadObf: A JavaScript Obfuscator based on Multi-objective Optimization Algorithms**Proc. of the IEEE Intl. Conf. on Network and System Security (NSS 2013)*, Madrid, Spain, 2013, vol. 7873, pp. 336–349.

- J. Muszynski, S. Varrette, and P. Bouvry, “
,” in*Expected Running Time of Parallel Evolutionary Algorithms on Unimodal Pseudo-Boolean Functions over Small-World Networks**Proc. of the IEEE Congress on Evolutionary Computation (CEC’2013)*, Cancún, Mexico, 2013, pp. 2588–2594.

- B. Bertholon, S. Varrette, and S. Martinez, “
,” in*ShadObf: A C-source Obfuscator based on Multi-objective Optimization Algorithms**Proc. of the 16th Intl. Workshop on Nature Inspired Distributed Computing (NIDISC 2013), part of the 27th IEEE/ACM Intl. Parallel and Distributed Processing Symposium (IPDPS 2013)*, Boston (Massachusetts), USA, 2013, pp. 435–444.

- M. Jarus, S. Varrette, A. Oleksiak, and P. Bouvry, “
,” in*Performance Evaluation and Energy Efficiency of High-Density HPC Platforms Based on Intel, AMD and ARM Processors**Proc. of the Intl. Conf. on Energy Efficiency in Large Scale Distributed Systems (EE-LSDS’13)*, Vienna, Austria, 2013, vol. 8046, pp. 182–200.

- M. Guzek, S. Varrette, V. Plugaru, J. E. Sanchez, and P. Bouvry, “
,” in*A Holistic Model of the Performance and the Energy-Efficiency of Hypervisors in an HPC Environment**Proc. of the Intl. Conf. on Energy Efficiency in Large Scale Distributed Systems (EE-LSDS’13)*, Vienna, Austria, 2013, vol. 8046, pp. 133–152.

- J. Muszyński, S. Varrette, P. Bouvry, F. Seredyński, and S. U. Khan, “
,”*Convergence Analysis of Evolutionary Algorithms in the Presence of Crash-Faults and Cheaters**Intl. Journal. of Computers and Mathematics with Applications (CAMWA)*, vol. 64, no. 12, pp. 3805–3819, Dec. 2012.

- B. Bertholon, S. Varrette, and P. Bouvry, “
,” in*CertiCloud: a Novel TPM-based Approach to Ensure Cloud IaaS Security**Proc. of the 4th IEEE Intl. Conf. on Cloud Computing (CLOUD 2011)*, Washington DC, USA, 2011, pp. 121–130.

- B. Bertholon, S. Varrette, and P. Bouvry, “
,” in*A Signature Scheme for Distributed Executions based on Control flow Analysis.**Proc. of the 19th Intl. conference on Security and Intelligent Information Systems (SIIS 2011)*, Warsaw, Poland, 2011, vol. 7053, pp. 85–102.

- B. Bertholon, C. Cérin, C. Coti, J.-C. Dubacq, and S. Varrette, “
,” vol. 1, S. Haddad, F. Kordon, L. Pautet, and L. Petrucci, Eds. Wiley, 2011, pp. 237–300.*Distributed Systems (volume 1); Design and Algorithms*

- D. Dunlop, S. Varrette, and P. Bouvry, “
,” in*Deskilling HPL - Using an Evolutionary Algorithm to Automate Cluster Benchmarking**Proc. of 8th Intl. Conf. on Parallel Processing and Applied Mathematics - Part II (PPAM 2009)*, Wroclaw, Poland, 2009, vol. 6068, pp. 102–114.

- S. Guelton, T. Gautier, J.-L. Pazat, and S. Varrette, “
,” in*Dynamic Adaptation Applied to Sabotage Tolerance**Proc. of the IEEE 17th Euromicro Intl. Conf. on Parallel, Distributed, and Network-Based Processing (PDP 2009)*, Weimar, Germany, 2009, pp. 237–244.

- D. Dunlop, S. Varrette, and P. Bouvry., “
,” in*On the Use of a Genetic Algorithm in High Performance Computer Benchmark Tuning**Proc. of the IEEE Intl. Symposium on Performance Evaluation of Computer and Telecommunication Systems (SPECTS’08)*, Edinburgh, UK, 2008, pp. 105–113.

- S. Varrette, “
,” PhD thesis, INP Grenoble and Université du Luxembourg, 2007.*Sécurité des Architectures de Calcul Distribué: Authentification et Certification de Résultats*

- J.-L. Roch and S. Varrette, “
,” in*Probabilistic Certification of Divide & Conquer Algorithms on Global Computing Platforms. Application to Fault-Tolerant Exact Matrix-Vector Product**Proc. of the ACM Intl. Workshop on Parallel Symbolic Computation’07 (PASCO’07)*, London, Ontario, Canada, 2007, pp. 88–92.

- J.-G. Dumas, J.-L. Roch, E. Tannier, and S. Varrette,
, 1st ed. Dunod, 2007.*Théorie des Codes : Compression, Cryptage et Correction*

- A.Krings, J.-L. Roch, S. Jafar, and S. Varrette, “
,” in*A Probabilistic Approach for Task and Result Certification of Large-scale Distributed Applications in Hostile Environments**Proc. of the European Grid Conference (EGC2005)*, Amsterdam, Netherlands, 2005, vol. 3470, pp. 323–333.

- S. Varrette, J.-L. Roch, and F. Leprevost, “
,” in*FlowCert : Probabilistic Certification for Peer-to-Peer Computations**Proc. of the 16th Symposium on Computer Architecture and High Performance Computing (SBAC-PAD 2004)*, Foz do Iguaçu, Brazil, 2004, pp. 108–115.