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Abstract-In this paper we investigate the behavior of degreebased clustering algorithms with respect to their stability and attack-resistance. Our attack scenario tries to bias the clustering head selection procedure by sending faulty degree claims. We propose a randomized variant of the highest degree algorithm which is proved, through experimental results, attack-resistant without imposing significant overhead to the clustering performance. In addition, we extend our proposal with a cooperative consistent clustering algorithm which integrates security into the clustering decision achieving attacker identification and classification.

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Purpose – The purpose of this paper is to present the SociaLib system, which is a collaborative digital library system. The system uses Drupal content management system to implement Web 2.0 functionalities and facilitate collaboration and cooperation between its users. It offers a variety of functions, like wikis, forums and it is also accessible from microbrowsers. Design/methodology/approach – The paper starts with a reference to collaboration in Digital Libraries and states related work. Then, it introduces the SociaLib system, including implementation and functionalities. There is also an example of how such a system can be used in a real-world situation. Ideas for future work are also included. Findings – The system was evaluated using a usability questionnaire on a subject of 50 people. The results were promising, showing user acceptance and satisfaction. Originality/value – This paper offer collaborative solutions to Digital Library users, helping them communicate and cooperate with colleagues on their research. The system uses Web 2.0 functions that enable the user to be more productive and also work mobile if he wishes.

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