To enhance the robustness of a proxy multi-signature scheme and improve its efficiency, a novel proxy signature paradigm is proposed referred to as In this paradigm, multiple proxy signer candidates identity-based pro...To enhance the robustness of a proxy multi-signature scheme and improve its efficiency, a novel proxy signature paradigm is proposed referred to as In this paradigm, multiple proxy signer candidates identity-based proxy multi-signature （IBPMS）. are employed to play a role of the single proxy signer in the existing model. A provably secure IBPMS scheme is presented which requires only one round broadcast operation. Performance analysis demonstrates that the new scheme outperforms the existing multi-signature schemes in robustness and communication. These properties are rendered to our IBPMS scheme as a more practical solution to secure e-transaction delegation applications of proxy signatures.展开更多
Radio broadcasting services in Thailand are in transition and face an uncertain future. This situation has arisen from enforcement of the 2010 Frequency Allocation and Telecommunications Business Act and the establish...Radio broadcasting services in Thailand are in transition and face an uncertain future. This situation has arisen from enforcement of the 2010 Frequency Allocation and Telecommunications Business Act and the establishment of the National Broadcasting and Telecommunications Commission （NBTC） as a single, combined regulatory body for broadcasting and telecommunications. The Act brings in significant changes through ＂liberalization＂ in telecoms and broadcasting markets. Key events expected in the future, such as the implementation of AEC in 2015 and the transformation from analog to digital systems will have significant detrimental impact on the Thai broadcasting industry. These changes will affect 524 AM and FM radio stations and around 7,000 community radio operations. This paper gives a picture of radio broadcasting industry, especially of community radio stations, their history, present and future. It also argues that the survival of radio stations in Thailand after 2015 will depend on （l） its social, institutional, financial, and technical abilities; and （2） the ability of NBTC to adopt and enforce policy and regulation for promoting free and fair competition.展开更多
基金Supported by the National Basic Research Program of China(No.2012CB315905)the National Natural Science Foundation of China(No.61272501)the Fund of Tianjin Key Laboratory of Civil Aircraft Airworthiness and Maintenance in CAUC and a General grant from Civil Aviation Flight University of China(No.J2013-31,Q2014-48)
文摘To enhance the robustness of a proxy multi-signature scheme and improve its efficiency, a novel proxy signature paradigm is proposed referred to as In this paradigm, multiple proxy signer candidates identity-based proxy multi-signature （IBPMS）. are employed to play a role of the single proxy signer in the existing model. A provably secure IBPMS scheme is presented which requires only one round broadcast operation. Performance analysis demonstrates that the new scheme outperforms the existing multi-signature schemes in robustness and communication. These properties are rendered to our IBPMS scheme as a more practical solution to secure e-transaction delegation applications of proxy signatures.
文摘Radio broadcasting services in Thailand are in transition and face an uncertain future. This situation has arisen from enforcement of the 2010 Frequency Allocation and Telecommunications Business Act and the establishment of the National Broadcasting and Telecommunications Commission （NBTC） as a single, combined regulatory body for broadcasting and telecommunications. The Act brings in significant changes through ＂liberalization＂ in telecoms and broadcasting markets. Key events expected in the future, such as the implementation of AEC in 2015 and the transformation from analog to digital systems will have significant detrimental impact on the Thai broadcasting industry. These changes will affect 524 AM and FM radio stations and around 7,000 community radio operations. This paper gives a picture of radio broadcasting industry, especially of community radio stations, their history, present and future. It also argues that the survival of radio stations in Thailand after 2015 will depend on （l） its social, institutional, financial, and technical abilities; and （2） the ability of NBTC to adopt and enforce policy and regulation for promoting free and fair competition.
