Christof Beierle and Gregor Leander (IMAGE) Ruhr-University Bochum Caption Christof Beierle and Gregor Leander are experts for the design and the analysis of cryptographic algorithms. Credit RUB, Marquard Usage Restrictions The image may only be used for reporting about Ruhr-Universität Bochum in the context of the press release "A backdoor in mobile phone encryption from the 90s still exists", published in June 2021. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.