Methods and apparatuses for selective data encryption
US8625791B2 · kind B2 · utility
2Cited by
1References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 30, 2009 |
| Grant date | Jan 7, 2014 |
| Priority date | — |
| Expiry date | Dec 28, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/34
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of encryption, using an encryption key K with key length k, of at least one message M comprising uniformly distributed symbols, k bits are encrypted of messages at least k bits long, while shorter messages are lengthened, e.g. by padding or concatenation, to obtain a lengthened message at least k bits long before encryption. The encryption efficiency is thus optimized while the encryption security is retained. The encryption method is particularly suitable for JPEG2000 encoded packets comprising a message M. Also provided are an encryption apparatus, a decryption method and a decryption apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.