Reproduction of secure keys by using distributed key generation data
US4864615A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 27, 1988 |
| Grant date | Sep 5, 1989 |
| Priority date | — |
| Expiry date | May 27, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A key security system provides for the reproduction of secure keys by using distributed key generation data and a distributed encrypted prekey. The system encrypts program key generation data with a program key prekey in accordance with a first encryption algorithm to produce the program key; processes the program key to produce a keystream; and processes an information signal with the keystream to produce a scrambled information signal. The program key prekey is encrypted with a category key in accordance with a second encryption algorithm to produce an encrypted program key prekey. The scrambled information signal, the program key generation data and the encrypted program key prekey are distributed to descramblers. The descrambler within the key security system decrypts the distributed encrypted program key prekey with the category key in accordance with the second encryption algorithm to reproduce the program key prekey; encrypts the distributed program key generation data with the reproduced program key prekey in accordance with the first encryption algorithm to produce the program key; processes the reproduced program key to reproduce the keystream; and processes the distribut…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.