×

Method and apparatus for embedding authentication information within digital data

  • US 6,047,374 A
  • Filed: 05/26/1999
  • Issued: 04/04/2000
  • Est. Priority Date: 12/14/1994
  • Status: Expired due to Term
First Claim
Patent Images

1. A method for extracting a bit string of information from a digital data block which includes the bit string of information and digital data comprising a digital representation of an object, the bit string of information encoding knowledge of interest to a receiver of the digital data block, comprising the steps of:

  • a) providing a digital data block having digital representation data comprising a digital representation of an object and a bit string of information embedded and encrypted therein, said bit string of information encoding knowledge of interest to a receiver of the digital data block and having been encrypted according to a predetermined encryption process and embedded according to a predetermined embedding process so that said bit string is not readily noticeable when said digital data block is converted into a non-digital form;

    b) processing said digital data block having said bit string embedded and encrypted therein by both a de-embedding step and a decryption step to segregate said bit string from said digital representation data in said digital data block, said de-embedding step being the inverse of said predetermined embedding process and said decryption step being the inverse of said predetermined encryption process; and

    c) retrieving said segregated bit string of information encoding knowledge of interest to a receiver of said digital data block.

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