• Proceedings of the Korea Information Processing Society Conference
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• 2008.11a
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• pp.1375-1378
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• 2008

아날로그방송 중단을 앞두고 케이블방송은 디지털 CATV 로 전환하기 위해 노력 중이다. 이를 위해 케이블방송은 단순히 방송의 디지털화 뿐만 아니라, PPV(Pay Per View), PVR(Personal Video Recorder), VOD(Video On Demand) 와 같은 서비스를 가입자에게 제공하기 시작했다. 이와 같은 서비스들은 대부분 유료서비스로 가입자의 수신권한을 확인하기 위해 다양한 종류의 CAS(Conditional Access System)를 사용하고 있다. 2008년 관련법의 정비와 함께 IPTV(Internet Protocol TV) 시범서비스가 시작 되었는데, IPTV 역시 실시간 방송, VOD 서비스를 기본 서비스로 규정하고 있기 때문에 CAS 의 사용이 필수적이다. 본 논문에서는 디지털 CATV 와 IPTV 에서 사용하는 수신제한시스템을 분석하고, 가입자와 방송사업자 모두에게 도움이 되는 발전방향이 무엇인지 제시하고자 한다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.19 no.6
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• pp.161-174
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• 2009

IPTV provides their services only for their subscribers who have a eligibility to watch it by using Conditional Access System(CAS). CAS has been servicing their contents for subscribers by using set-top box or cable card so far, but these days, to solve the compatibility between kinds of devices, linkage with other services as DRM and confirming stability, the research of Downloadable CAS(DCAS) is being advanced steadily. On this paper, we analyse the vulnerability of DCAS based on the OpenCable and make up for the vulnerability in DCAS, then proposes to use secure DCAS system for IPTV. Also we show the result of the research and analyse the satisfaction of requirements.

• Journal of Broadcast Engineering
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• v.14 no.4
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• pp.463-474
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• 2009

By employing the subscriber concept in broadcasting services, IPTV (Internet Protocol Television) operators provide various grades of services to subscribers based on the billing level of the subscribers. With the income from subscribers for a basis, IPTV operators plan to provide high quality services. Since Web browser-based IPTV provides T-commerce and E-commerce services as well as television services, users may frequently visit other service domains to buy goods or content. To provide the user with charged or private services, these service domains request authentication of user. The existing authentication system is not appropriate for the IPTV service environment because the environment unavoidably forces the user to cross from one authentication-based service domain to another. Single sign-on provides a user with transparent authentication services by enabling an authenticated user to move between authentication-based service domains without any re-authentication. Like this distributed environment, since the IPTV service environment also provides a variety of authentication-based services, transparent authentication service needs to be provided to subscribers who want to access charged or private services. In this paper, we propose a new user authentication scheme for the IPTV environment. This scheme integrates the Security Assertion Markup Language (SAML), which is a standard for XML-based single sign on. We validate this scheme using a simple use case scenario.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.2B
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• pp.302-312
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• 2010

Internet Protocol Television (IPTV) service is the convergence service of the telecommunication and broadcasting that provides various bidirectional multimedia contents by IPTV service subscribe's request through the high-speed internet. However, the proposed technologies current do not guarantee the security such as authentication between Set-Top-Box (STB) and the user mobile devices available IPTV service at home domain, and authentication of mobile user device at out of door. This paper proposes the authentication protocol for distributing content securely from STB to the users' mobile devices at home domain and authentication for network access and IPTV service access when the user's mobile device is moved out of the house. The proposed scheme using the proxy signature enables to distribute and protect securely the contents protected through an underlying Conditional Access System (CAS) without re-encrypting then that the existing scheme should employ. Then this protocol supports the authentication scheme to get service access authentication based on network access authentication using the signature, which the STB issued on behalf of the trust authority of IPTV service provider. Also the proposed authentication protocol reduces the total communication overhead and computation time comparing to the other authentication protocol.

• Journal of Broadcast Engineering
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• v.14 no.3
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• pp.280-287
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• 2009

An IPTV (Internet Protocol Television) technology is the new convergence technology of the telecommunication and broadcasting which provides various bidirectional TV services. To provide these services only to legal subscribers, mutual authentication between set-top box connected with TV set and the smart card owned by a subscriber is needed. In this paper, we propose an attribute-based mutual authentication scheme that only someone who is satisfied with some attributes, such as titles or departments, can access the contents provided by the IPTV service in an organization. We also show that the proposed scheme is secure. Our proposed scheme has a virtue that user can access various services, provided by an organization where he/she belongs to, according to their attributes with only one time registration. As far as we know, this is the first attribute-based authentication scheme which can be applied to any organizations in IPTV environments.

• The Journal of the Korea Contents Association
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• v.16 no.12
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• pp.181-191
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• 2016

We analyzed the search word of the media content in the IPTV service, and as a result we found that an important factor is general meta information as well as content(material, plot, etc.) and emotion information in the media content selection criteria of customers. Therefore, in this research, in order to efficiently provide various media contents of IPTV to users, we designed the emotion classification system for utilizing the emotion information of the media content. Next, we proposed 'personalized media contents curation system based on emotion information' for organizing the media contents, through the various processing steps. Finally, to demonstrate the effectiveness of this system, we conducted a user satisfaction survey(72.0 points). In addition, the results of comparing the results based on popularity and the results of the proposed system showed that the ratio leading to the actual users' viewing behavior was 10 times higher.

• Journal of Advanced Navigation Technology
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• v.14 no.6
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• pp.996-1001
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• 2010

In this paper, network selection algorithm for services of mobile IPTV(internet protocol television) and implementation of a hierarchical processing system for reducing overload by terminal with low speed is proposed. This algorithm selects the network according to the following priorities derived from formulas; value that uses remaining bandwidth, network cost, signal strength. If terminal has a low processing power for using selected network and TV service, quality of service declines due to the system overloading. Hence, we implemented system which processes selected network and TV services accomplished by layer divided. Through experiments results, the method of direct user network selection waits for bandwidth assignment. However, on the one hand, that waiting time in exhausted situation will be very long. On the other hand, if we consider the priority plot of used networks, we should select the network with the best state. Therefore, data transmission rate will keep on average and the waiting time will be low.

• Journal of KIISE:Information Networking
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• v.37 no.6
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• pp.444-452
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• 2010

To avoid a channel zapping delay, the device needs to predict a next channel and must download it. Previous researches suggest algorithms based on assumption by utilizing many data. How to select and download future channels is a main issue in IPTV system. Most proposal based on assumption do not guarantees complete performance of channel zapping. In this paper, we suggest an effective method to avoid a channel zapping time with a constant performance by using a number remote controller key information.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.15 no.4
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• pp.845-850
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• 2011

In this paper, we proposed the digital contents distribution business model for the operation of integration between heterogeneous systems in order to use IPTV. Also, we designed and implemented the protection management system through this distribution business model. This proposed model maintains interoperability between the heterogeneous systems, creates rights protection document based on REL, and provides the new version of packaged digital contents to itself by packaging the digital contents. Overall, it ultimately offers an interoperable environment. Moreover, since we pre-defines the relations among REL data based on MPEG-21 standard, which creates the newly packaged digital contents, it is easy to edit data. We can expect to save expenses of digital contents distribution and rights protection technology. Additionally, we can further improve security by encapsulating the security technology of CAS and DRM system.

• Journal of Internet Computing and Services
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• v.10 no.1
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• pp.83-91
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• 2009

The advertisement system on TV is categorized into full duplex TV and Internet Protocol Television (IPTV). For the full duplex TV or the IPTV, channel providers need a number of advertisements and pay enormous expenses for them. Therefore, this study proposes how to reduce unnecessary expenses based on users' preferences. The advertisement system based on users' preferences is designed to decrease unnecessary advertisements with less expense. To identify preferences in usual advertisements and animation advertisements is to reduce expenses due to the necessity of a number of advertisements. The proposed system was designed to provide full duplex advertisements for profits of advertisement industry and considered users' disposition based on preferences of broadcasting advertisements, through which users can have advertisement desired and providers can expect less advertisement expenses and more profits.