For many years, the pay-TV system has attracted a lot of users. Users have recently expressed the desire to use mobile TV or mobile payment via anonymous protocols. The mobile users have also received their services over cellular communications networks. Each mobile device receives services from each head end systems. With increasing numbers of users and the expansion of Internet, user's privacy has become crucial important. When a device leaves the head end system's range, it must receive services from another head end system. In this paper, we review Chen et al's scheme and we highlight some weaknesses, including privilege insider attack and user traceability attack. Finally, we alleviate the scheme and analyze the alleviated scheme using both heuristic and formal methods.
It is expected that in 2025, the first phase of the most innovative city in the world will be opened. Seemingly NEOM city's developers have forgotten about an attractive technology called Metaverse, presented almost simultaneously along with the NEOM idea in 2017. This study stipulates that Metaverse can appreciably assist in delivering a broad digital perspective of the future to governments, futurologists, people, and particularly the NEOM developers. Also, this study briefly addresses the benefits and opportunities of releasing Metaverse-based NEOM for the Kingdom of Saudi Arabia (KSA), engineers, developers, futurologists, and people worldwide. Moreover, it is illustrated that KSA and people worldwide can benefit from the Metaverse version. For example, people can visit the world's dream city as digital tourists. As a result of this revolutionary idea, KSA can earn considerable revenue by land pre-selling and providing remote services.
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