×

Family of encryption keys

  • US 7,995,758 B1
  • Filed: 11/30/2004
  • Issued: 08/09/2011
  • Est. Priority Date: 11/30/2004
  • Status: Active Grant
First Claim
Patent Images

1. A method comprising:

  • generating an original symmetric encryption key useable to encrypt and decrypt information;

    generating from the original symmetric encryption key a family of symmetric encryption keys useable to encrypt and decrypt information, the symmetric encryption keys of the family having a relationship such that a descendent key of the family is derivable from each key that is an ancestor of the descendent key in the family; and

    rolling over a key used in securing information, said rolling over comprising providing a next symmetric encryption key of the family in an order opposite that of an order of key generation;

    wherein said rolling over is performed using a hardware processor; and

    wherein the family of symmetric encryption keys is used in a document control system to secure documents, the method further comprising synchronizing offline access information with a client, the offline access information comprising a key from the family of symmetric encryption keys.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×