The Dirty Laundry of Stored Value Washing Cards

Explore the security vulnerabilities of stored-value laundry cards through comprehensive reverse engineering analysis in this 31-minute DEF CON 33 RF Village conference talk. Delve into the internal mechanisms of contactless payment solutions commonly used in laundry facilities worldwide, examining how value storage and modification systems operate within these cards. Discover a critical data structure vulnerability identified during the investigation that poses significant security risks extending far beyond laundry facilities to similar contactless payment systems globally. Learn about the reverse engineering methodologies used to analyze these widespread localized payment solutions and understand the broader implications for contactless system security across various industries.