Importance

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Abstract

A procedure and system reduces latency in restoring encrypted or compressed and encrypted data through a security appliance. The security appliance is coupled to a sequential access device and is configured to encrypt or compress and encrypt data provided by an initiator for secure storage on a sequential access device. To that end, the security appliance intercepts a read request issued by an initiator to access the data stored on the device, and forward the request to the device. Upon return of the requested data from the device, the security appliance restores (decrypts or decrypts and decompresses) the data prior to returning it to the initiator. The appliance also issues a “read ahead” (retrieve beyond the request) request to the device for predetermined amount of additional data for caching on the appliance. The appliance restores the read ahead data that is returned from the device and caches that additional data in memory in anticipation of one or more subsequent read requests for the data from the initiator.

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First Claim