Explore practical attacks against Attribute-based Encryption (ABE) in this 38-minute Black Hat conference talk. Delve into the intricacies of ABE, a cryptographic system that implements fine-grained access control on data without relying on a trusted entity to enforce it. Examine multi-authority variants of ABE and their applications in healthcare, Internet of Things, and cloud systems. Learn about the components of ABE, including elliptic curves, pairings, and secret sharing. Analyze how ABE schemes can fail theoretically and study specific attacks on pairing-free elliptic-curve schemes. Investigate open-source ABE implementations and gain insights into the Venema-Alpár framework. Presented by Antonio de la Piedra and Marloes Venema, this talk provides a comprehensive overview of ABE vulnerabilities and their practical implications.