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Paper Abstract and Keywords
Presentation 2006-09-14 15:05
Yusei Nishimoto, Satoshi Fujitsu, Shunji Sunasaki, Takeshi Kimura, Hiroyuki Imaizumi, Yoshihiro Fujita (NHK) MoMuC2006-43
Abstract (in Japanese) (See Japanese page) 
(in English) A Conditional Access System (CAS) is essential for controlling digital content usage in narrow-band broadcasting such as terrestrial 1-segment broadcasting and digital audio broadcasting. This paper assumes that broadcasting receivers means not only mobile phones but also mobile receivers without two-way communication functions, such as mobile receivers for use in motor vehicles and portable receivers used in combination with personal digital assistants (PDAs) and portable game stations. A CAS provides a mechanism to restrict broadcasting reception and content playback to only subscribers. Here, contract information must be distributed to each and every receiver to distinguish between subscribers and non-subscribers, and this must be done by broadcasting in the case of mobile receivers without two-way communication functions. In B-CAS for digital satellite broadcasting, the system broadcasts contract information in this way. This, however, requires a wide transmission band of about 300 kbps to transmit contract information for individual receivers, which means that the current technology for distributing contract information by B-CAS cannot be applied to narrow-band broadcasting. In older to resolve this problem, we have developed a new CAS that is capable of transmitting contract information even for narrow-band broadcasting. This paper describes the operation scheme used to calculate the transmission rate of contract information when applying this system. We also clarify by security evaluation and evaluation of implementation that the proposed CAS can be applied to actual services.
Keyword (in Japanese) (See Japanese page) 
(in English) terrestrial 1-segment broadcasting / digital audio broadcasting / narrow-band broadcasting / conditional access / access control / contract information / /  
Reference Info. IEICE Tech. Rep., vol. 106, pp. 39-44, Sept. 2006.
Paper #  
Date of Issue 2006-09-07 (MoMuC) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee MoNA ITE-BCT ITE-CE  
Conference Date 2006-09-14 - 2006-09-15 
Place (in Japanese) (See Japanese page) 
Place (in English) Osaka Musium of History 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Integration of Mobile Communication and Broadcasting 
Paper Information
Registration To ITE-BCT 
Conference Code 2006-09-MoMuC-BCT-CE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English)
Sub Title (in English)  
Keyword(1) terrestrial 1-segment broadcasting  
Keyword(2) digital audio broadcasting  
Keyword(3) narrow-band broadcasting  
Keyword(4) conditional access  
Keyword(5) access control  
Keyword(6) contract information  
1st Author's Name Yusei Nishimoto  
1st Author's Affiliation NHK (NHK)
2nd Author's Name Satoshi Fujitsu  
2nd Author's Affiliation NHK (NHK)
3rd Author's Name Shunji Sunasaki  
3rd Author's Affiliation NHK (NHK)
4th Author's Name Takeshi Kimura  
4th Author's Affiliation NHK (NHK)
5th Author's Name Hiroyuki Imaizumi  
5th Author's Affiliation NHK (NHK)
6th Author's Name Yoshihiro Fujita  
6th Author's Affiliation NHK (NHK)
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Speaker Author-1 
Date Time 2006-09-14 15:05:00 
Presentation Time 25 minutes 
Registration for ITE-BCT 
Paper # MoMuC2006-43 
Volume (vol) vol.106 
Number (no) no.245 
Page pp.39-44 
Date of Issue 2006-09-07 (MoMuC) 

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