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Explore critical side-channel vulnerabilities discovered in WhatsApp and Signal that affect over 3 billion users worldwide in this 39-minute conference talk from Ekoparty Security Conference. Learn how attackers can exploit these flaws using only a target's phone number to track activity across all of a user's devices, demonstrating the national-scale security implications for platforms that serve as the backbone of personal, business, and government communication in Latin America. Discover additional attack vectors including resource exhaustion and denial-of-service techniques that prove how small research teams can uncover critical flaws in massive systems. Watch real-world exploitation demos with clear graphics and examples designed for both newcomers and seasoned researchers. Gain insights into previously undisclosed findings that didn't make it into the original research paper, including additional techniques and insights that make this the most complete version of the research. Understand the broader implications of these vulnerabilities and be inspired to challenge the security of platforms that billions rely on daily, presented by researchers Philipp Frenzel from SBA Research and Max Guenther from the University of Vienna.
