Title:
METHOD FOR TRACING TRAITOR RECEIVERS IN A BROADCAST ENCRYPTION SYSTEM
Document Type and Number:
WIPO Patent Application WO2002060118
Kind Code:
A3
Abstract:
A method for tracing traitor receivers in a broadcast encryption system. The method includes using a false key to encode plural subsets representing receivers in the system. The subsets are derived from a tree using a Subset-Cover system, and the traitor receiver is associated with one or more compromised keys that have been obtained by a potentially cloned pirate receiver. Using a clone of the pirate receiver, the identity of the traitor receiver is determined, or the pirate receiver clones are rendered useless for decrypting data using the compromised key by generating an appropriate set of subsets.
Inventors:
LOTSPIECH JEFFREY BRUCE
NAOR DALIT
NAOR SIMEON
NAOR DALIT
NAOR SIMEON
Application Number:
PCT/GB2002/000312
Publication Date:
September 19, 2002
Filing Date:
January 23, 2002
Export Citation:
Assignee:
IBM (US)
IBM UK (GB)
IBM UK (GB)
International Classes:
H04L9/08; H04N7/167; H04N21/266; H04N21/418; H04N21/433; H04N21/4623; (IPC1-7): H04L9/08; H04N7/167
Domestic Patent References:
| WO1999033270A1 | 1999-07-01 |
Other References:
YOSHIDA M ET AL: "A SUBSCRIBER-EXCLUDING AND TRAITOR-TRACING BROADCAST DISTRIBUTION SYSTEM", IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS, COMMUNICATIONS AND COMPUTER SCIENCES, INSTITUTE OF ELECTRONICS INFORMATION AND COMM. ENG. TOKYO, JP, vol. E84-A, no. 1, 1 January 2001 (2001-01-01), pages 247 - 255, XP001006546, ISSN: 0916-8508
D. NAOR ET AL.: "Revocation and Tracing Schemes for Stateless Receivers", July 2001, XP002203174
D. NAOR ET AL.: "Revocation and Tracing Schemes for Stateless Receivers", July 2001, XP002203174
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