Methods and devices for selective format-preserving data encryption
US9473829B2 · kind B2 · utility
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8Claims
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Key dates
| Filing date | Sep 12, 2012 |
| Grant date | Oct 18, 2016 |
| Priority date | — |
| Expiry date | Sep 12, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/43853
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Selective data encryption of a file, in particular an H.264/MPEG-4 AVC data stream. If a first unit in the data stream is to be encrypted, it is encrypted and the encryption is put into a further unit, preferably in the data stream. A substitution unit is generated and put in the place of the first unit; if necessary, at least one header value is taken from the first unit for use in the substitution unit. A decryptor receives the encrypted data stream, extracts and decrypts the further unit and replaces the substitution unit with a regenerated first unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.