Rie Shigetomi

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—This paper presents a novel security architecture for in-vehicle communication. The ratio of electronics to vehicle equipment is steadily increasing. And novel vehicles will also have connectibility to public networks to provide many kinds of services. Therefore, they are expected to suffer from a wide variety of threats and the electronic control units(More)
Anonymity is a highly desired feature in Internet transactions. On the other hand, unconditional anonymity may contain some traps. For instance, it may cause irresponsible, or even criminal, use of the Internet. Thus, it would be desirable to have revocable anonymity in our internet applications. In this work, we suggest an anonymous authentication scheme(More)
— In an overview paper called State of the Art: Embedding Security in Vehicles, Wolf et al. give a general state-of-the-art overview of IT security in vehicles and describe core security technologies and relevant security mechanisms. In this paper we show that a formal analysis of many of the related properties is possible. This indicates that many expected(More)
—Explosive progress in networking and outsourcing storage increases the use of information retrieval technologies, in massive datasets. Nowadays, there are varieties of storage-providers through the internet, such as e-mail accounts and public database, which are convenient to store and exchange electronic files and medias. Typically, the storage-provider(More)
SUMMARY The first refreshable anonymous token scheme proposed in [1] enables one to provide services in such a way that each of its users is allowed to enjoy only a fixed number of services at the same time. In this paper, we show that the scheme in [1] is insecure and propose a provably secure refreshable partial anonymous token scheme which is a(More)