Publications

Practical Evaluation of the Crypto-Agility Maturity Model
Cryptographic agility is a key prerequisite for maintaining the long-term security of digital communication, particularly in light of …
Leonie Wolf, Samson Umezulike, Gurur Öndarö, Sebastian Schinzel, Fabian Ising
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BreachHydra: Measuring the Resilience of an Underground Data Breach Forum
Underground forums are thriving markets for illicit goods and services, such as data leaks. While these forums regularly come under the …
Marius Brockhoff, Lukas Schmidt, Fabian Ising, Sebastian Schinzel
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Characterizing Hosting and Security Practices for Public-Facing LDAP Servers
The Lightweight Directory Access Protocol (LDAP) is widely used to make structured data available for standardized lookup, which may …
Gustavo Luvizotto Cesar, Gurur Öndarö, Jonas Kaspereit, Fabian Ising, Sebastian Schinzel, Mattijs Jonker, Realph Holz
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S/MINE: Collecting and Analyzing S/MIME Certificates at Scale
We report on the first broad analysis of real-world S/MIME certificates for digitally signing and encrypting emails. We collected more …
Gurur Öndarö, Jonas Kaspereit, Samson Umezulike, Christoph Saatjohann, Fabian Ising, Sebastian Schinzel
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LanDscAPe: Exploring LDAP Weaknesses and Data Leaks at Internet Scale
The Lightweight Directory Access Protocol (LDAP) is the standard technology to query information stored in directories. These …
Jonas Kaspereit, Gurur Öndarö, Gustavo Luvizotto Cesar, Simon Ebbers, Fabian Ising, Christoph Saatjohann, Ralph Holz, Sebastian Schinzel
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KIM: Kaos In der Medizin
Die sichere E-Mail-Infrastruktur für Ärztinnen, Apothekerinnen, Krankenversicherungen und Kliniken in Deutschland, KIM - Kommunikation …
Christoph Saatjohann, Fabian Ising, Sebastian Schinzel
Dissertation: Exploring Corner Cases of Modern Applied Cryptography
The advent of instantaneous communication via the Internet in the 80s and 90s has revolutionized the way we communicate. Suddenly, we …
Fabian Ising
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Content-Type: Multipart/Oracle - Tapping into Format Oracles in Email End-to-End Encryption
S/MIME and OpenPGP use cryptographic constructions repeatedly shown to be vulnerable to format oracle attacks in protocols like TLS, …
Fabian Ising, Damian Poddebniak, Tobias Kappert, Christoph Saatjohann, Sebastian Schinzel
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Sicherheit Medizintechnischer Protokolle im Krankenhaus
Medizinische Einrichtungen waren in den letzten Jahren immer wieder von Cyber-Angriffen betroffen. Auch wenn sich diese Angriffe …
Christoph Saatjohann, Fabian Ising, Matthias Gierlings, Dominik Noss, Sascha Schimmler, Alexander Klemm, Leif Grundmann, Tilman Frosch, Sebastian Schinzel
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Grand Theft App: Digital Forensics of Vehicle Assistant Apps
Due to the increasing connectivity of modern vehicles, collected data is no longer only stored in the vehicle itself but also …
Simon Ebbers, Fabian Ising, Christoph Saatjohann, Sebastian Schinzel
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Why TLS Is Better without STARTTLS: A Security Analysis of STARTTLS in the Email Context
TLS is one of today’s most widely used and best-analyzed encryption technologies. However, for historical reasons, TLS for email …
Damian Poddebniak, Fabian Ising, Hanno Böck, Sebastian Schinzel
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CORSICA: Cross-Origin Web Service Identification
Vulnerabilities in private networks are difficult to detect for attackers outside of the network. While there are known methods for …
Christian Dresen, Fabian Ising, Damian Poddebniak, Tobias Kappert, Thorsten Holz, Sebastian Schinzel
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STALK: Security Analysis of Smartwatches for Kids
Smart wearable devices become more and more prevalent in the age of the Internet of Things. While people wear them as fitness trackers …
Christoph Saatjohann, Fabian Ising, Luise Krings, Sebastian Schinzel
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Office Document Security and Privacy
OOXML and ODF are the de facto standard data formats for word processing, spreadsheets, and presentations. Both are XML-based, …
Jens Müller, Fabian Ising, Christian Mainka, Vladislav Mladenov, Sebastian Schinzel, Jörg Schwenk
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Practical Decryption exFiltration: Breaking PDF Encryption
The Portable Document Format, better known as PDF, is one of the most widely used document formats worldwide, and in order to ensure …
Jens Müller, Fabian Ising, Vladislav Mladenov, Christian Mainka, Sebastian Schinzel, Jörg Schwenk
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Efail: Breaking S/MIME and OpenPGP Email Encryption Using Exfiltration Channels
OpenPGP and S/MIME are the two prime standards for providing end-to-end security for emails. We describe novel attacks built upon a …
Damian Poddebniak, Christian Dresen, Jens Müller, Fabian Ising, Sebastian Schinzel, Simon Friedberger, Juraj Somorovsky, Jörg Schwenk
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Master's Thesis: Analyzing Oracle Attacks against E-mail End-to-End Encryption
Fabian Ising
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