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Explore the often-overlooked security implications of usernames in this 20-minute conference talk from USENIX Security '25. Discover how usernames, despite being as ubiquitous as passwords and subject to similar creation rules, play a crucial role in system security that extends far beyond simple identification. Trace the evolution of username usage from mainframe computers to modern cloud environments, examining decades of implementation patterns and their security ramifications. Learn about the two fundamental patterns that govern how operating systems utilize usernames for security purposes, both of which remain actively employed in contemporary systems. Gain insights into why these patterns have persisted throughout computing history and understand their current applications across different platforms. Develop a deeper appreciation for how usernames function as a security mechanism and why security professionals should pay closer attention to their implementation and management alongside traditional password security measures.
