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News & Blog

04.04.2025

[blog] China Ex­ten­ded its SNI Cen­sor­ship to QUIC

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20.02.2025

Cen­sor­ship Ana­lyses of the Ir­a­ni­an HT­TP and DNS Cen­sor at Vir­tu­al FOCI 2025

Today, Felix presented our new publication on Iranian HTTP and DNS censorship at the Virtual FOCI 2025.

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18.02.2025

[blog] Auto­mated Bib­li­o­graphy Man­age­ment in Over­leaf with Zotero and a Cus­tom Proxy

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19.11.2024

[blog] Cen­sors Ig­nore Un­en­cryp­ted HT­TP/2 Traffic

Using Unencrypted HTTP/2 to Circumvent Censorship

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15.07.2024

Cen­sor­ship Cir­cum­ven­tion with HT­TP Re­quest Smug­gling in Bris­tol

On the 15th July 2024, Niklas presented our new publication on censorship circumvention with HTTP request smuggling in Bristol at the Free and Open Communications on the Internet conference 2024 (Summer FOCI'24).

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23.10.2023

3D Print­ing Se­cur­ity in Hong Kong

Last week, Jost presented his work on the security of the 3MF file in Hong Kong at the 26th International Symposium on Research in Attacks, Intrusions and Defenses (RAID 2023). Some impressions from the journey:

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10.10.2023

Three Theses Awar­ded “CAST Förder­preis IT-Sich­er­heit 2023”

Three of the students who have written their thesis with us won an award for outstanding theses in the context of IT security. We congratulate Marten Schmidt on his third place with the topic of “Analyzing the QUIC Ecosystem With the QUIC-Scanner” in the “Master’s Thesis” category, Philipp Breuch on another third place in the category “Bachelor’s Thesis” with the topic “Web Key Directory and other key exchange methods for OpenPGP”, and Niklas…

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27.06.2023

[blog] Cir­cum­vent­ing the GFW with TLS Re­cord Frag­ment­a­tion

How Fragmentation Can Be Extended to the TLS Layer

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19.04.2023

[blog] We Really Need to Talk About Ses­sion Tick­ets

A Large-Scale Analysis of Cryptographic Dangers with TLS Session Tickets

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06.04.2023

Früh­lings-Uni

As a part of the "Frühlings-Uni", Juraj has held a presentation on the importance of IT security and presented CTFs.

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06.03.2023

[blog] Bach­el­or's Thes­is: Web Key Dir­ect­ory and Oth­er Key Ex­change Meth­ods for Open­P­GP

a security analysis on the OpenPGP key exchange method Web Key Directory

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02.12.2022

[blog] Us­age Stat­ist­ics of 3D Print­ing File Formats

an overview of the usage of different file formats used for 3D printing

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11.10.2022

Two of Our Stu­dents are Awar­ded “CAST Förder­preis IT-Sich­er­heit 2022”

Two of the students who have written their thesis with us won an award for outstanding theses in the context of IT security. We congratulate Simon Nachtigall on his first place with the topic of “Evaluation of TLS session tickets” in the “Master’s Thesis” category and Nico Heitmann on another first place in the category “Bachelor’s Thesis” with the topic “Security Analysis of the Web Conferencing System BigBlueButton”.

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11.08.2022

Our study on e-mail sig­na­ture spoof­ing at­tacks presen­ted at SOUPS

Do you use S/MIME or OpenPGP to secure your emails? Do you think that validating e-mail signatures is easy? If your answer is yes, you should take a look at our study published together with our colleagues from Karlsruhe Institute of Technology, Münster University of Applied Sciences, and Ruhr University Bochum.

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11.08.2022

TLS-An­vil presen­ted at USENIX Se­cur­ity

Together with our colleagues from the Ruhr University Bochum, we have published our paper on combinatorial testing of TLS implementations. The paper is presented at USENIX Security in Boston this week.

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System Security

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33098 Paderborn
Germany

Universität Paderborn

Warburger Str. 100
33098 Paderborn
Germany

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