Method and apparatus for providing hierarchical key system in re

Details Method and apparatus for providing hierarchical key system in re Method and apparatus for providing hierarchical key system in re

1997-03-07

2000-05-30

Hayes, Gail O.

Cryptography

Key management

Key distribution

380210, 380278, 380283, 380284, 380 45, H04L 900, H04K 100

Patent

active

060699574

ABSTRACT:
An encryption system for restricted-access television systems. Decryption keys, which are used to decrypt program material, are transmitted to customers in a restricted-access television system. The keys are transmitted as a hierarchy, wherein one key unlocks another key, and the last key unlocked is used to decrypt program material. Such a hierarchy is sometimes called "key-upon-key" encryption. The system transmits a second key that produces a first key from a cipher text (which first key decrypts a first program material) and wherein the second key also decrypts a second program material.

REFERENCES:
patent: 5237610 (1993-08-01), Gammie et al.
"Applied Cryptography," 2nd Edition, by Bruce Schneier (1995).

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