No keys to the kingdom required: a comprehensive investigation of missing authentication vulnerabilities in the wild. - Manuel Karl; Marius Musch; Guoli Ma; Martin Johns; Sebastian Lekies (IMC, 2022)

General Data Protection Runtime: Enforcing Transparent GDPR Compliance for Existing Applications. - David Klein 001; Benny Rolle; Thomas Barber; Manuel Karl; Martin Johns (CCS, 2023)

Privacy-Preserving Encoding and Scaling of Tabular Data in Horizontal Federated Learning Systems. - Tim Piotrowski; Zoltán Nochta; Manuel Karl; Martin Johns (ARES (1), 2025)

Comma Separated Vulnerabilities: Detecting Formula Injection in the Wild. - Manuel Karl; Louis Bettels; Martin Johns; David Klein 001 (WOOT, 2025)

The Impact of Default Mobile SDK Usage on Privacy and Data Protection. - Simon Koch 001; Manuel Karl; Robin Kirchner; Malte Wessels; Anne Paschke; Martin Johns (Proc. Priv. Enhancing Technol., 2025)