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Cloud-based data backup and sync with secure local storage of access keys

  • US 9,330,245 B2
  • Filed: 12/03/2012
  • Issued: 05/03/2016
  • Est. Priority Date: 12/01/2011
  • Status: Active Grant
First Claim
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1. A computer-implemented method, the method comprising:

  • receiving a user master password at a client device on behalf of a user;

    generating, during a device authentication process, a unique user device key identifier comprising a first portion generated based on a hardware identifier associated with the user device and a second portion generated based on a portion of the user master password, wherein the generated unique user device key identifier is not used to encrypt data on the user device;

    decrypting the unique user device key identifier with the user master password at the client device, wherein the unique user device key identifier is specific to a unique combination of the user and the client device, and wherein decrypting the unique user device key identifier comprises generating, at the client device, a cryptographic key from the user master password and decrypting, at the client device, a user file containing an encrypted unique user device key identifier using the generated cryptographic key;

    sending a request to access a storage server from the client device without sending either of the user master password or a hash of the user master password;

    sending the unique user device key identifier to the storage server; and

    in response to sending the unique user device key identifier, receiving access to elements of the storage server controlled by the user.

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