hello world

Hi, my name is Dennis and I am leading the cyber defence team at a healthcare IT provider. Before that I was the CISO in public service at multi-university institutions. I have further experience in research (focus on network security). I did my PhD at the Chair for Systems Security at Ruhr University Bochum.

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research interests

• Network Security (e.g., DNS, NTP)
• Internet Measurements
• Big Data Security and Privacy

theses

• Doctoral Thesis (submitted Jan. 2021, defended Mar. 2021) – English: Large-scale Measurements for Enhancing Network Security

• Master’s Thesis (submitted Dec. 2015, defended Jan. 2016) – German: Automatisierte kontextsensitive Analyse von iOS Apps

• Bachelor’s Thesis (submitted Oct. 2013, defended Oct. 2013) – German: Entwicklung von TLS - Unterschiede der SSL/TLS Versionen und Fallbeispiele

peer-reviewed publications

2021

• Digging Deeper: An Analysis of Domain Impersonation in the Lower DNS Hierarchy – Florian Quinkert, Dennis Tatang, Thorsten Holz – Conference on Detection of Intrusions and Malware & Vulnerability Assessment (DIMVA), Virtual, July 2021
• Extended Abstract: A First Large-scale Analysis on Usage of MTA-STS – Dennis Tatang, Robin Flume, Thorsten Holz – Conference on Detection of Intrusions and Malware & Vulnerability Assessment (DIMVA), Virtual, July 2021
• Likes are not Likes A Crowdworking Platform Analysis – Dennis Tatang, Philip Kreißel, Michael Sehring, Florian Quinkert, Martin Degeling and Thorsten Holz – International Workshop on Cyber Social Threats (CYSOC), co-located with ICWSM 2021, virtually, June 2021
• Reining in the Web’s Inconsistencies with Site Policy – Stefano Calzavara, Tobias Urban, Dennis Tatang, Marius Steffens, Ben Stock – Network and Distributed System Security Symposium (NDSS), San Diego, California, USA, February 2021

2020

• Plenty of Phish in the Sea: Analyzing Potential Pre-Attack Surfaces – Tobias Urban, Matteo Große-Kampmann, Dennis Tatang, Thorsten Holz, Norbert Pohlmann – European Symposium on Research in Computer Security (ESORICS), Guildford, UK, September 2020
• Measuring the Impact of the GDPR on Data Sharing in Ad Networks – Tobias Urban, Dennis Tatang, Martin Degeling, Thorsten Holz, Norbert Pohlmann – ACM Asia Conference on Computer & Communications Security (ASIACCS), Taipei, Taiwan, June 2020

2019

• A Study on Subject Data Access in Online Advertising after the GDPR – Tobias Urban, Dennis Tatang, Martin Degeling, Thorsten Holz, Norbert Pohlmann – International Workshop on Data Privacy Management (DPM) 2019, co-located with ESORICS 2019 in Luxembourg, September 2019
• Study of DNS Rebinding Attacks on Smart Home Devices – Dennis Tatang, Tim Suurland, Thorsten Holz – International Workshop on Attacks and Defenses for Internet-of-Things (ADIoT) 2019, co-located with ESORICS 2019 in Luxembourg, September 2019
• Large-scale Analysis of Infrastructure-leaking DNS Servers – Dennis Tatang, Carl Schneider, Thorsten Holz – Conference on Detection of Intrusions and Malware & Vulnerability Assessment (DIMVA), Gothenburg, Sweden, June 2019
• Analyzing leakage of personal information by malware – Tobias Urban, Dennis Tatang, Thorsten Holz, Norbert Pohlmann – Journal of Computer Security, 2019

2018

• Towards Un­der­stan­ding Pri­va­cy Im­pli­ca­ti­ons of Ad­wa­re and Po­ten­ti­al­ly Un­wan­ted Pro­grams – To­bi­as Urban, Den­nis Tatang, Thors­ten Holz, Nor­bert Pohl­mann – Eu­ropean Sym­po­si­um on Re­se­arch in Com­pu­ter Se­cu­ri­ty (ESO­RICS), Bar­ce­lo­na, Spain, Sep­tem­ber 2018 - Best Paper Award
• Mas­ters of Time: An Over­view of the NTP Eco­sys­tem – Teemu Ry­ti­lah­ti, Den­nis Tatang, Ja­nosch Köp­per, Thors­ten Holz – IEEE Eu­ropean Sym­po­si­um on Se­cu­ri­ty and Pri­va­cy (Euro S&P), Lon­don, United King­dom, April 2018
• An Em­pi­ri­cal Study on On­line Price Dif­fe­ren­tia­ti­on – Tho­mas Hup­pe­rich, Den­nis Tatang, Ni­co­lai Wilkop, Thors­ten Holz – ACM Con­fe­rence on Data and Ap­p­li­ca­ti­ons Se­cu­ri­ty and Pri­va­cy (CO­DAS­PY 2018) Tempe, AZ, March 2018

2017

• SDN-Guard: Pro­tec­ting SDN Con­trol­lers Against SDN Root­kits – Den­nis Tatang, Flo­ri­an Quin­kert, Joel Frank, Chris­ti­an Röpke, Thors­ten Holz – IEEE Work­shop on Se­cu­ri­ty in NFV-SDN (SN-2017), Ber­lin, No­vem­ber 2017

other publications

2019

• Cybersecurity Research: Challenges and Course of Action – secUnity - supporting the security community – secUnity-Roadmap on Cybersecurity Research, February 2019
• A Study of Newly Observed Hostnames and DNS Tunneling in the Wild – Dennis Tatang, Florian Quinkert, Nico Dolecki, Thorsten Holz – Technical Report, arXiv:1902.08454, February 2019

2018

• The Unwanted Sharing Economy: An Analysis of Cookie Syncing and User Transparency under GDPR – Tobias Urban, Dennis Tatang, Martin Degeling, Thorsten Holz, Norbert Pohlmann – Technical Report, arXiv:1811.08660, November 2018

2017

• An Empirical Study on Price Differentiation Based on System Fingerprints – Thomas Hupperich, Dennis Tatang, Nicolai Wilkop, Thorsten Holz – Technical Report, arXiv:1712.03031, December 2017

2016

• Poster: Automated, Context-Sensitive Analysis of iOS Applications – Dennis Tatang – IEEE European Symposium on Security and Privacy (Euro S&P 2016), Saarbrücken, Germany