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Protecting Documents Using Policies and Encryption

  • US 20120036370A1
  • Filed: 07/28/2011
  • Published: 02/09/2012
  • Est. Priority Date: 07/28/2010
  • Status: Active Grant
First Claim
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1. A method comprising:

  • providing a system comprising unencrypted and encrypted document content, wherein an unencrypted document is encrypted to become an unencrypted document, and the encrypted document is larger in size the unencrypted document from which it is derived;

    providing an encryption service driver executing on a computing device;

    permitting access to an encrypted document by an application program on the computing device;

    when an access to an encrypted document occurs, using the encryption service intercept the access of the encrypted document;

    at the encryption service, identifying the application program attempting to access the encrypted document;

    from the encryption service, sending identification information on the application program to a policy enforcer component, executing on the computing device;

    using the policy enforcer, determining if the application program can be trusted to protect unencrypted content of the encrypted document;

    if the application program is determined to be trusted, receiving a decryption key at the encryption service and the encryption service decrypting the encrypted document to produce unencrypted content, and providing the unencrypted content to the application program; and

    if the application program is determined not to be trusted, providing encrypted content of the encrypted document to the application program.

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