Apparatus and method for securing captured data transmitted between two sources
US5751809A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 1997 |
| Grant date | May 12, 1998 |
| Priority date | — |
| Expiry date | Feb 4, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/805
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Implemented preferably within a video camera, a secure data capture device is used to prevent a captured data clip from be fraudulently altered without detection. The secure data capture device performs "time-bracketing" and/or "sequence ordering" operations to preserve data integrity through implementation of two registers incorporating a "State of the Universe" ("SOTU") number and a "sequence" number, respectively. Time-bracketing is performed by digitally signing a running hash value representing the data clip appended to the SOTU number before the digital signature is "timestamped". Sequence ordering is performed by digitally signing the digest of the data frame or multiple data frames along with the sequence number.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.