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Data accessibility control

  • US 10,592,680 B2
  • Filed: 10/31/2014
  • Issued: 03/17/2020
  • Est. Priority Date: 11/08/2013
  • Status: Active Grant
First Claim
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1. A method of controlling the accessibility of data to a computer processor configured to context switch between a user context and a secure context, the method comprising:

  • obtaining an identifier;

    determining dependent on the identifier, in the secure context, whether to make data accessible in the user context; and

    ,in the event that it is determined to make data accessible, controlling a map of data storage to provide access to the data in the user context according to a selected map, wherein controlling a map of data storage comprises choosing between at least two pre-stored maps of the data storage based on the identifier to choose the selected map, wherein each said map of data storage comprises an association between a plurality of file names and a corresponding plurality of storage addresses;

    wherein the selected map is made available to applications in the user context to enable the applications to use the selected map to request access to data identified by the map,wherein in the event that data requested by the applications comprises encrypted data, the encrypted data is decrypted in the secure context to provide unencrypted data to the applications in the user context.

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