Importance

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Abstract

A cryptographically signed filesystem provides a central database resident on a server that contains database objects. The server creates startup software to be installed in a client system's read only memory. The startup software contains a hash value for a second stage loader. The server also creates software for a bootstrap loader object which typically contains the operating system for a client system and also the bootstrap loader's hash value and a digital signature that is unique to the server. A root filesystem object is also created containing operational code and data for the client system's functionality. A hash table file is stored in the bootstrap loader that contains the names of each file in the root filesystem along with their corresponding hash values. The startup software and objects created by the server are initially installed on a client device at the time of manufacture. The client performs a staged bootup sequence that confirms that the hash value is correct for each of the objects before they are executed. The digital signature of the bootstrap loader is verified. If a hash value or digital signature is incorrect, the client device is disabled or the file deleted or replaced. The server can update a client's bootstrap loader and root filesystem at any time through the transmission of slices.

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First Claim