For future Internet, information-centric networking (ICN) is considered a potential solution to many of its current problems. However, concern regarding the protection of user data persists. This paper presents an access control mechanism that will allow users to set fine-grained access policies for applications in named data networking (NDN), a popular ICN architecture. Using an attribute-based encryption scheme with an immediate revocation of privileges, data security is guaranteed. The mechanism inserts a proxy server to mediate the access to the protected data and to inspect for revocation. As an optional feature, the NDN router can add proxy server functions. According to the experiments, the proposed security mechanism proved functional in terms of processing time, memory usage, and file size, which influence both storage and transmission and demonstrate efficiency in manipulating dozens of attributes in an access policy.

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The diffusion of agile methodologies in software development makes them more mature for corporative environment. However, teaching agile methodologies on the academic environment poses many difficulties and limitations. This paper describes a case study where an innovative approach for teaching software development technologies was adopted. In this approach, the entire course was designed to fit Scrum's principles, so that the students could apply them as they were learning it. Also, the course's main project was to be developed in sprints, as proposed in Scrum. After almost two years using this approach, in this paper we describe our experience and perform a critical analysis. We observed some positive points, such as the practical nature of learning by example, and a better preparation of the students regarding agile methodologies. As negative points, we highlight the impossibility of delivering complete products in earlier sprints, and some interaction and collaboration difficulties. The main conclusion of this study is that, for the approach to work in our academic scenario, a modified version of the Scrum methodology was necessary.