Modular design and networked solutions are the basic answers to master complexity of today’s and future systems. Complexity will even grow dramatically as the desired functionality by the end user is increasing drastically. A basically efficient approach to achieve proper interoperability in distributed systems is to apply standard 'layers' onto which the application itself is built, to specify...

In this paper, we trace the origin and development of the concept of egocentrism in Piaget’s work. We evaluate a number of criticisms that have been leveled against the concept of egocentrism. Based on our evaluation, we propose a reconceptualization of the concept of egocentrism as a decentering process with different phases that is recapitulated at different stages of development. We provide ...

In a homomorphic signature scheme, given a vector of signatures ~σ corresponding to a dataset of messages ~ μ, there is a public algorithm that allows to derive a signature σ′ for message μ′ = f(~ μ) for any function f . Given the tuple (σ′, μ′, f) anyone can publicly verify the result of the computation of function f . Along with the standard notion of unforgeability for signatures, the securi...