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A new approach to cryptographically enforced data access controls that uses public key cryptography to secure large numbers of documents with arbitrarily large numbers of authorized users. This approach uses a proxy re-encryption (PRE) scheme to handle the problems typical of public key cryptography including key management, rotation, and revocation, in a highly scalable way, while providing end-to-end encryption and provable access.
Presented by Bob Wall at the 2018 ACM Cryptography Workshop in Incheon, Korea.