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In this paper, we propose a refined proxy deposit protocol based on the scheme proposed by Yu and Lei, A proxy deposit protocol for e-cash systems, in: ICCSA2001, 2001, p. 289 and implement two mathematic models (for ElGamal and RSA scheme) base on the scheme of Chen et al., refined proxy deposit protocol for e-cash systems, in: ICCSA2002, 2002, p. 141. And in consideration of the relationship in most typical e-cash scheme (various studies), a merchant must maintain an account at the issuer for depositing the received e-cash from customers. Since there will be a lot of issuers in the real world, each merchant must maintain an account at each issuer for depositing all kinds of e-cash. In order to reduce the onus of the merchants, the concept of deposit-delegation protocol will be introduced in this paper such that a merchant only has to maintain an account at its trading bank (as an acquirer) and delegates all deposit business to it. [Copyright &y& Elsevier]

An authenticated multiple-key agreement protocol enables two entities to authenticate each other and establish multiple common keys in a two-pass interaction, and a protocol without using a conventional hash function simplifies its security assumption on only public hard problem. In 2001, Yen et al. proposed an improved multiple-key agreement protocol to overcome the attacks that break the previous variants. However, the authors show that an impersonator can easily forge message without being detected, and can establish common session keys with the communicating party. To overcome all the weakness, we propose an improved scheme that also achieves better key utilization, compared to the previous variants. [Copyright &y& Elsevier]

Recently, Mu and Varadharajan proposed an efficient electronic-voting schemes. They claimed to protect voter’s anonymity, to detect double voting, and to authenticate the voters. In this article, we will show the failures of the claimed functions: (1) the authority can easily identify the owner of a cast ballot; (2) a valid voter or any one can vote more than once without being detected; (3) any one can forge ballot without being authenticated. In addition to the failures of the claimed functions, we also point out other weaknesses in Mu–Varadharajan’s scheme. [Copyright &y& Elsevier]

In this paper, we first adopt the concept of self-certified public keys to propose a new signature scheme with message recovery. The proposed scheme has two properties that the signer’s public key can simultaneously be authenticated in verifying the signature, and the receiver also obtains the message. As compared with the certificate-based signature scheme with message recovery, the public space and the communication cost are reduced. Moreover, we also present two variants based on the proposed scheme. One is an authenticated encryption scheme that only allows a specified receiver to verify and recover the message. The other scheme is the authenticated encryption scheme with message linkages, which is used to transmit large message. [Copyright &y& Elsevier]

Abstract: Mobile communication is a milestone technology that has brought people a kind of universal convenience otherwise unattainable. From GSM to UMTS, the mobile communication technologies, like all the other great inventions in human history, have gone through such fast-paced advancements since the very first day it came to existence that each day we seem to be using a newer, more powerful device than before to talk to people close by or far away. We are so used to this convenience that it is hard to imagine how life could carry on without cell phones. However, when cell phone users roam from city to city crossing different system facilitators’ domains of services, besides the conveyance of the signals, some charging problems may also arise between or among the service providers. In this paper, we shall present a simple mobile communication billing system that can help solve roaming-related charging problems. Our new system can be used in a wide variety of applications without having to modify the standard UMTS protocol, and it only causes slight, readily ignorable traffic increase. As we can expect, the new mobile communication billing system will be a friendly design that comes in handy for both service providers and users. [Copyright &y& Elsevier]