Byzantine Agreement requires a set of parties in a distributed system to agree on a value even if some parties are corrupted. The invention comprises a method for achieving agreement among participating network devices in an asynchronous network is disclosed that makes use of cryptography, specifically of threshold digital signatures and a distributed coin-tossing protocol.

 
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> Document authentication using the physical characteristics of underlying physical media

> Initializing, maintaining, updating and recovering secure operation within an integrated system employing a data access control function
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