Security

Achieving Leakage Resilience Through Dual System Encryption

Date Added: Dec 2010
Format: PDF

In this paper, the authors show that strong leakage resilience for cryptosystems with advanced functionalities can be obtained quite naturally within the methodology of dual system encryption, recently introduced by waters. They demonstrate this concretely by providing fully secure IBE, HIBE, and ABE systems which are resilient to bounded leakage from each of many secret keys per user, as well as many master keys. This can be realized as resilience against continual leakage if they assume keys are periodically updated and no (or logarithmic) leakage is allowed during the update process.