Method and device for inserting and authenticating a digital signature in digital data
US7216232B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 1999 |
| Grant date | May 8, 2007 |
| Priority date | — |
| Expiry date | Apr 20, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/3269
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for inserting a digital signature into digital data is provided. The digital data has bits and the method includes the steps of: assigning predetermined bits of the digital data for receiving the digital signature; signing the digital data excluding the predetermined bits resulting in the digital signature; and inserting the digital signature into the predetermined bits of the digital data for subsequent authentication of the digital data. Also provided is a method for authenticating digital data having the embedded digital signature in the predetermined bits of the digital data including the steps of: extracting the digital signature from the predetermined bits; decrypting the digital signature from the digital data resulting in a first hash; applying a known one-way hashing function used by an encoder of the digital data to the digital data excluding the predetermined bits resulting in a second hash; and comparing the first hash to the second hash wherein if the first hash matches the second hash the digital data is authentic. In a preferred version of the methods of the present invention, the method further includes the step of inserting associated data into the digital…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.