Practical Attacks on Attribute-Based Encryption

Attribute-based encryption (ABE) implements fine-grained access control on data where the ability to decrypt a ciphertext is determined by the attributes owned by a user of the system. Hence, data can be stored by an entity that is not necessarily trusted to enforce access control. Moreover, multi-authority variants of ABE extend these capabilities to multiple-domain settings and remove the requirement of having a trusted third party. ABE is typically exemplified in the healthcare setting, where all nurses of the hospital A can only decrypt certain records whereas doctors of the same hospital have access to additional information about the patients. Further, ABE has been proposed to secure the Internet of Things and enforce authorization in cloud systems.... By: Antonio de la Piedra & Marloes Venema Full Abstract & Presentation Materials: https://www.blackhat.com/eu-21/briefings/schedule/#practical-attacks-against-attribute-based-encryption-25058