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In vehicular communications, a group key that is only shared by the group subscribers is widely used for encrypting or signing multicast messages. A major issue with the group key is how to efficiently and securely transmit an updated group key for which numerous research results have been published. However, in the existing schemes, because vehicles receive the group key only from roadside units...
Since the novel ideas on secret sharing were first proposed in 1979, a number of variants have been invented, based on these two schemes. The secret sharing schemes have selectively been applied to many distributed storage systems connected by both wired and wireless communication links for securely storing files. However, when gathering file fragments necessary to recover a file from network-based...
A logical key hierarchy (LKH) based key management approach is the most common way to manage a group key with less rekeying overhead. However, the LKH approach causes inefficiency of rekeying the group key in mobile cellular networks since it does not consider the characteristics of the networks, such as the cell-based network topology and the user's mobility. This paper proposes an efficient and...
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