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Lecture Notes in Computer Science
Functional encryption (FE) enables fine-grained access control of encrypted data while promising simplified key management. In the past few years substantial progress has been made on functional encryption and a weaker variant called predicate encryption. Unfortunately, fundamental impossibility results have been demonstrated for constructing FE schemes for general functions satisfying a simulation-based definition of security. We show how to use hardware tokens to overcome these impossibilitydoi:10.1007/978-3-642-42045-0_7 fatcat:odtsxwdsq5eizhy7jybjlzssr4