Paper Abstract and Keywords |
Presentation |
2006-01-20 09:25
A Key Management Scheme for Time-Limited Service Toshiya Tanaka, Minoru Kuribayashi, Masakatu Morii (Kobe Univ.) |
Abstract |
(in Japanese) |
(See Japanese page) |
(in English) |
On a broadcast-type contents distribution, a time-limited key
management scheme has been proposed which enable a broadcaster to
provide contents to each user with each predined period.
We have proposed a time-limited key management scheme based on the
property of chaotic map such that a user key is usable for the
decryption of broadcasted contents as long as the time of key-updating
operation is less than a certain threshold. However, in order to
extend the expiration date of user key, the size of the key must be
increased in a linear order, and hence the scheme is not practical.
In this paper, we improve the key-updating operation to produce a
small key with long expiration date. The basic idea is to vary the
positions for extracting the keys dependent on the updating time.
Since the expiration date is determined by the size of the error
insulted in a user key and its effect for the upper bits in each
updating operation, we control the effect by modifying the positions
for extracting the keys and the iteration time of chaotic map required
for each key-updating operation. We also show the security of our
scheme and compare it with other schemes. |
Keyword |
(in Japanese) |
(See Japanese page) |
(in English) |
digital contetnts / time limited service / chaotic map / expiration date / / / / |
Reference Info. |
IEICE Tech. Rep., vol. 105, Jan. 2006. |
Paper # |
|
Date of Issue |
2006-01-13 (OIS) |
ISSN |
Print edition: ISSN 0913-5685 |
Download PDF |
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Conference Information |
Committee |
IN ICM LOIS |
Conference Date |
2006-01-19 - 2006-01-20 |
Place (in Japanese) |
(See Japanese page) |
Place (in English) |
Kyoto Univ. |
Topics (in Japanese) |
(See Japanese page) |
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Paper Information |
Registration To |
LOIS |
Conference Code |
2006-01-IN-TM-OIS |
Language |
Japanese |
Title (in Japanese) |
(See Japanese page) |
Sub Title (in Japanese) |
(See Japanese page) |
Title (in English) |
A Key Management Scheme for Time-Limited Service |
Sub Title (in English) |
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Keyword(1) |
digital contetnts |
Keyword(2) |
time limited service |
Keyword(3) |
chaotic map |
Keyword(4) |
expiration date |
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1st Author's Name |
Toshiya Tanaka |
1st Author's Affiliation |
Kobe University (Kobe Univ.) |
2nd Author's Name |
Minoru Kuribayashi |
2nd Author's Affiliation |
Kobe University (Kobe Univ.) |
3rd Author's Name |
Masakatu Morii |
3rd Author's Affiliation |
Kobe University (Kobe Univ.) |
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Speaker |
Author-1 |
Date Time |
2006-01-20 09:25:00 |
Presentation Time |
25 minutes |
Registration for |
LOIS |
Paper # |
OIS2005-80 |
Volume (vol) |
vol.105 |
Number (no) |
no.529 |
Page |
pp.5-9 |
#Pages |
5 |
Date of Issue |
2006-01-13 (OIS) |