In 1999, Sun et al. proposed a new (t, n) threshold proxy signature scheme based on Zhang’s threshold proxy signature scheme. But in 2003 Hsu et al. pointed out that Sun’s scheme suffered from a drawback and demonstrated an improvement to counter it. In this paper we point out that Hsu’s scheme suffers from an insider attack against their scheme. That is, a malicious proxy signer can forge a va...

In this paper, we consider the problem of k-out-of-n secret sharing scheme, capable of identifying t cheaters. We design a very simple k-out-of-n secret sharing scheme, which can identify up to t cheaters, with probability at least 1 − ε, where 0 < ε < 1/2, provided t < k/2. This is the maximum number of cheaters, which can be identified by any k-out-of-n secret sharing scheme, capable of ident...

A non-interactive (t,n)-publicly veriable secret sharing scheme (non-interactive (t,n)-PVSS scheme) is a (t,n)-secret sharing scheme in which anyone, not only the participants of the scheme, can verify the correctness of the produced shares without interacting with the dealer and participants. The (t,n)-PVSS schemes have found a lot of applications in cryptography because they are suitable for<...

Recently, Tseng et al. proposed an improvement on Peyravian and Zunic’s protected password transmission scheme and protected changing scheme to remove some security flaws. However, as we will point out in this paper, any adversary can intercept the request for changing the password sent by a legal user and modify it with a wrong password. Furthermore, we shall also propose an improved version o...

and efficient arbitration is a key issue for high performance. In this paper, an arbitration scheme based on interference of wave is proposed. In this scheme, home node sends out multiple tokens in different frequencies, and nodes that are competing for bus can capture token by sending out wave that cancels its specific wave token. In this scheme, speed-of-light arbitration can be achieved, and...

Recently, Yang and Shieh proposed two password authentication schemes by employing smart cards. One is a timestamp-based password authentication scheme and the other is a nonce-based password authentication scheme. In 2002, Chan and Cheng pointed out that Yang and Shieh’s timestamp-based password authentication scheme was vulnerable to the forgery attack. However, in 2003, Sun and Yeh pointed o...

A horizontal-vertical partition scheme modification for fractal and hybrid image compression and an algorithm of its optimization are proposed. The proposed partition scheme efficiency analysis for two test images is carried out. The advantages of the proposed partition scheme in comparison to conventional horizontal vertical partition scheme and to Quadtree partition scheme are shown.

conclusions this study indicates that low-load rt results in greater accumulations in vl compared to high-load rt over the course of 8 weeks of training. results after adjusting for the pre-test scores, there was a significant difference between the two intervention groups on post-intervention total vl with a very large effect size (f (1, 15) = 16.598, p = .001, ηp2 = .525). there was a signifi...

medicines constitute a substantial proportion of out-of-pocket (oop) expenses in indian households. in order to address this issue, the government of india launched the jan aushadhi (medicine for the masses) scheme (jas) to provide cheap generic medicines to the patients (http://janaushadhi.gov.in/about_jan_aushadhi.html). these medicines are provided through the jan aushadhi stores established...