A Fault-tolerant Key Storage Service with Proactive Recovery
A lot of security architectures for digital systems have been developed that rely on the use of cryptographic keys, to provide their functionality. The distribution of symmetric keys between the encryption and decryption entities has always been a matter of concern, and there is no easy way to do this while maintaining the confidentiality and integrity of the keys. This thesis provides a service which while ensuring the confidential storage of cryptographic keys, also ensures that the system is tolerant to an unlimited number of failures, given that only a threshold number of failures occur during a defined window of system execution. The service also attempts to improve performance and availability by modeling a Byzantine Quorum system.
A potential application of the system is also shown by integrating the service with GridStat. GridStat is a middleware framework based on the publish-subscribe paradigm that provides flexible, robust, timely, and secure delivery of operational status information for the electric power grid. The system has been evaluated mostly with performance in mind and results show promising latencies in the operations provided by the service.
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