In this paper, we continue the study the round complexity of black-box zero knowledge in the bare public-key (BPK, for short) model previously started by Micali and Reyzin in [11]. Specifically we show the impossibility of 3-round concurrent (and thus resettable) black-box zeroknowledge argument systems with sequential soundness for non-trivial languages. In light of the previous state-of-the-a...

The common de facto of a KM strategy needs to move beyond outlining ‘know-how’ goals such as ‘becoming a knowledge-enabled enterprise’ to the realities of ‘know-why’. In fact the latter may prove to be more significant as it denotes levels of creativity and innovation which are key drivers to organizational performance. As such, the strategy must identify the key needs and issues within the org...

We propose a generalisation of Paillier’s probabilistic public key system, in which the expansion factor is reduced and which allows to adjust the block length of the scheme even after the public key has been fixed, without loosing the homomorphic property. We show that the generalisation is as secure as Paillier’s original system. We construct a threshold variant of the generalised scheme as w...

by reviewing the literature of km, it can be understood that there are different views about(to) knowledge management and its applications in public and private sectors which is due to the structural difference between these two economic sectors. in order to be able to exploit the benefits of knowledge management in public sector adequately, it is necessary to identify the best practices of km....

Paradigm shift in language education has caused many countries including Iran to reshuffle their public EFL educational program. However, such a promising trend in Iran has entailed serious challenges, which necessitated this study aimed at collecting data from 70 teachers and 70 students to investigate the CLT challenges in terms of both teachers' pedagogical and assessment areas. A Partial Le...