| Paper Abstract and Keywords |
| Presentation |
2004-07-20 14:45
A Secure Traitor Tracing Scheme against Key Exposure
Kazuto Ogawa, Arisa Fujii, Go Ohtake (NHK), Goichiro Hanaoka, Hideki Imai (U. of Tokyo), Keigo Majima, Kimiyuki Oyamada (NHK) |
| Abstract |
(in Japanese) |
(See Japanese page) |
| (in English) |
Copyright protection is a major issue in distributing content on the Internet. One well-known method of protecting copyright is a traitor tracing scheme. With this scheme, when a pirate decoder is made, the content provider can check the secret key contained in it and trace the authorized user (traitor). Furthermore, a forward secure public key cryptosystem has been developed. With this system, the user secret key is valid for a limited period of time, which means that even if it were exposed, the user would be affected only for a limited time period. In this paper, we propose a secure traitor tracing scheme against key exposure, which contains the properties of both a traitor tracing scheme and a forward secure public key cryptosystem. It is constructed by using a polynomial with two variables (the user identification and the time period) to generate the user secret keys. This scheme enables identifying the user from the keys included in the decoder and tracing at least one of the traitors, and it enables making the secret keys temporary by updating them at a specific time. The secret key can be updated only when the user has both his previous secret key and his master key. As a result, this scheme can be useful in preventing traitors from making illegal decoders and in minimizing the damage from accidental key exposure. |
| Keyword |
(in Japanese) |
(See Japanese page) |
| (in English) |
Traitor Tracing / Key Exposure / Key Updating / two variables polynomial / / / / |
| Reference Info. |
IEICE Tech. Rep., vol. 104, no. 199, ISEC2004-35, pp. 151-158, July 2004. |
| Paper # |
ISEC2004-35 |
| Date of Issue |
2004-07-13 (ISEC) |
| ISSN |
Print edition: ISSN 0913-5685 |
| Download PDF |
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| Conference Information |
| Committee |
ISEC IPSJ-CSEC |
| Conference Date |
2004-07-20 - 2004-07-21 |
| Place (in Japanese) |
(See Japanese page) |
| Place (in English) |
Tokushima Univ. |
| Topics (in Japanese) |
(See Japanese page) |
| Topics (in English) |
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| Paper Information |
| Registration To |
ISEC |
| Conference Code |
2004-07-ISEC-JPSCSEC |
| Language |
Japanese |
| Title (in Japanese) |
(See Japanese page) |
| Sub Title (in Japanese) |
(See Japanese page) |
| Title (in English) |
A Secure Traitor Tracing Scheme against Key Exposure |
| Sub Title (in English) |
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| Keyword(1) |
Traitor Tracing |
| Keyword(2) |
Key Exposure |
| Keyword(3) |
Key Updating |
| Keyword(4) |
two variables polynomial |
| Keyword(5) |
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| 1st Author's Name |
Kazuto Ogawa |
| 1st Author's Affiliation |
Japan Broadcasting Corporation (NHK) |
| 2nd Author's Name |
Arisa Fujii |
| 2nd Author's Affiliation |
Japan Broadcasting Corporation (NHK) |
| 3rd Author's Name |
Go Ohtake |
| 3rd Author's Affiliation |
Japan Broadcasting Corporation (NHK) |
| 4th Author's Name |
Goichiro Hanaoka |
| 4th Author's Affiliation |
University of Tokyo (U. of Tokyo) |
| 5th Author's Name |
Hideki Imai |
| 5th Author's Affiliation |
University of Tokyo (U. of Tokyo) |
| 6th Author's Name |
Keigo Majima |
| 6th Author's Affiliation |
Japan Broadcasting Corporation (NHK) |
| 7th Author's Name |
Kimiyuki Oyamada |
| 7th Author's Affiliation |
Japan Broadcasting Corporation (NHK) |
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| Speaker |
Author-1 |
| Date Time |
2004-07-20 14:45:00 |
| Presentation Time |
25 minutes |
| Registration for |
ISEC |
| Paper # |
ISEC2004-35 |
| Volume (vol) |
vol.104 |
| Number (no) |
no.199 |
| Page |
pp.151-158 |
| #Pages |
8 |
| Date of Issue |
2004-07-13 (ISEC) |
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