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Copyright of Journal of Medical Biochemistry is the property of Society of Medical Biochemists of Serbia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This paper presents a novel privacy-preserving cryptographic protocol for secure many-to-one communication systems, for example, data collection systems, data gathering systems, vehicular networks, smart-grids, and so on. The proposed solution provides message authenticity, integrity, and non-repudiation, while message senders are anonymous and untraceable. The protocol is based on group signatures with a time-bound membership. The protocol is designed to achieve efficiency on the client side where restricted devices are usually employed. On the other hand, the verification of many messages is efficient as well. Common group signature schemes offer the verification phase that needs some pairing operations and employs a long revocation list. Generally, the revocation list grows until scheme parameters and keys are recomputed. However, the reinitialization of all keys and parameters is not practical in large-scale communication systems. By applying the optimization techniques on the group signature scheme, the verification phase becomes more efficient, and the expiration of group member secret keys naturally reduces the length of a revocation list. In addition to the full cryptographic description, we implement the proposed protocol and outline the performance results. Copyright © 2015 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

This paper argues for the introduction of better privacy mechanisms and greater anonymity in electronic transactions. The introduction contains an overview of related work-namely group signatures and e-cash systems. Next, we present an original solution based on Σ-protocols, which leads to a scheme providing anonymous client authentication without any loss of client responsibility. The preserved client responsibility is assured by the spread revelation feature. This allows the identification of malicious users by the cooperation of two entities-namely, a service provider with a newly introduced Public Authority entity. Finally, we analyze the presented scheme from the point of view of security and efficiency. [ABSTRACT FROM AUTHOR]

The article discusses on the innovation of medical teaching. It reports that the program used to determine suitable application of physical activities to subjects according to their level of fitness and exercise test results, called KONSIL is introduced. It also reveals that information of the healthy and diseased subjects are required for the program to analyze and display the needed exercise for the subjects.