Traditionally, software processes improvement (SPI) has been approached from a problem-oriented perspective, focusing on diagnosing and solving problems using methods such as the IDEAL model and DMAIC. In contrast, appreciative inquiry is an approach that focuses on what is best in an organization in order to further develop this to create a better future. It is, therefore, interesting to explo...

Abstract TRIVIUM is the simplest ECRYPT Stream Cipher project Candidate which deals with key and IV of length 80. Using the sequential Circuit Approximation method, introduced by Golic in 94, we derive a linear function of consecutive keystream bits which is hold with correlation coefficient of about 2. This shows that TRIVIUM is strong against linear sequential circuit approximation attack in ...

An additive and multiplicative privacy homomorphism is an encryption function mapping addition and multiplication of cleartext data into two operations on encrypted data. One such privacy homomorphism is introduced which has the novel property of seeming secure against a known-cleartext attack. An application to multilevel statistical computation is presented, namely classified retrieval of exa...

Security has played a major role in cognitive radio networks. Numerous researches have mainly focused on attacking detection based on source localization and detection probability. However, few of them took the penalty of attackers into consideration and neglected how to implement effective punitive measures against attackers. To address this issue, this article proposes a novel penalty mechani...

The Advanced Encryption Standard (AES) is widely recognized as the most important block cipher in common use nowadays. This high assurance in AES is given by its resistance to ten years of extensive cryptanalysis, that has shown no weakness, not even any deviation from the statistical behaviour expected from a random permutation. Only reduced versions of the ciphers have been broken, but they a...

We present a distinguishing attack against SOBER-128 with linear masking. We found a linear approximation which has a bias of 2−8.8 for the non-linear filter. The attack applies the observation made by Ekdahl and Johansson that there is a sequence of clocks for which the linear combination of some states vanishes. This linear dependency allows that the linear masking method can be applied. We a...

We propose a simple timed broadcasting process calculus for modelling wireless net-work protocols. The operational semantics of our calculus is given in terms of a labelledtransition semantics which is used to derive a standard (weak) bi-simulation theory. Basedon our simulation theory, we reformulate Gorrieri and Martinelli’s timed Generalized Non-Deducibility on Compositio...

We present two block cipher distinguishers in a setting where the attacker knows the key. One is a distinguisher for AES reduced the seven rounds. The second is a distinguisher for a class of Feistel ciphers with seven rounds. This setting is quite different from traditional settings. We present an open problem: the definition of a new notion of security that covers attacks like the ones we pre...

Cloud computing has gaining importance in the recent past due to the conjunction of well-known key features, such as virtualization and pay-by-use, which together form an innovative concept. Even if cloud computing does not have a widely accepted definition, it has been used for many companies to deploy its infrastructures and promote their business. However, the lack of standards seems to be a...

In numerous modern stream ciphers, the internal state consists of a large array of pseudo-random words, and the output key-stream is a relatively simple function of the state. In [16], it was heuristically shown that in various cases this structure may lead to distinguishing attacks on the cipher. In this paper we further investigate this structural attack. We present a rigorous proof of the ma...