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The anonymous channels have been the essence of numerous protocols that include anonymous message passing between peers. The mixnet structure is one way to accomplish the anonymity . Since the publication of the Chaumian mixnet, there have been many practical implementations. There are two main approaches to implement mixnets: the decryption (Chaumian) and the re-encryption mixnets. In this paper we analyze four types of mixnets, of which one decryption and three re-encryption types. They were implemented in the Java programing language and evaluated on several criterias as: the number of messages, the total number of nodes, the number of threshold nodes, and the key length of underlying crypto system. In the results section we compare the results from the practical tests to answer the research question, which type of mixnets has better features.

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This paper presents an overview of the proposed risk management framework and how it is designed to meet the challenges usually faced by IT-centric micro and small companies when implementing risk management. The issues and challenges identified for the IT-centric micro and small companies are centered around the exposure to various risks and necessity to have a risk management approach which covers these various risks, as well as to limited resources for risk management and necessity for usable and comprehensive framework. The new framework is based on the analysis of the best practices in risk management concepts as well as direct experience from dealing with over 20 companies in South-east Europe. The segments covered by the framework include people, policy, methodology and process, and tools.