Abstract This paper presents an application of data center IT architecture ontology model for corporate environments. The article is based PAS77 in order to get a service continuity view and uses Unified Foundation Ontology (UFO) to produce a well-founded ontology. It is built using the Conceptual Model Language OntoUML with the objective of preserving the ontologic prerogatives defined in the UFO.... This paper presents an application of data center IT architecture ontology model for corporate environments. The article is based PAS77 in order to get a service continuity view and uses Unified Foundation Ontology (UFO) to produce a well-founded ontology. It is built using the Conceptual Model Language OntoUML with the objective of preserving the ontologic prerogatives defined in the UFO. This model was applied to enterprise data center environments, being able to identify IT components and verify the adherence of these components describing the PAS77. Read More Read Less

Abstract This article presents a new signcryption scheme which is based on the Schnorr digital signature algorithm. The new scheme represents my personal contribution to signcryption area. I have implemented the algorithm in a program and here are provided the steps of the algorithm, the results and some examples. The paper also contains the presentation of the original Signcryption scheme, based... This article presents a new signcryption scheme which is based on the Schnorr digital signature algorithm. The new scheme represents my personal contribution to signcryption area. I have implemented the algorithm in a program and here are provided the steps of the algorithm, the results and some examples. The paper also contains the presentation of the original Signcryption scheme, based on ElGamal digital signature and discusses the practical applications of Signcryption in real life. The purpose of the study is to combine the public key encryption with Schnor digital signature in order to obtain less computational and communicational costs. Signcryption primitive is a better approach then Encrypt-then-Sign or Signthen- Encrypt methods regarding the costs. All these algorithms offer the possibility to transmit a message over an insecure channel providing both authenticity and confidentiality. Read More Read Less

Abstract Steganography is a modern, yet ancient, method of secret storage and access of communication, in contrast to cryptography, where the “enemy” is permitted to detect, intercept and modify messages without being able to violate certain security premises protected by the cryptosystem. Steganography is an art and a science. in our previous research, we showed that we had been able to... Steganography is a modern, yet ancient, method of secret storage and access of communication, in contrast to cryptography, where the “enemy” is permitted to detect, intercept and modify messages without being able to violate certain security premises protected by the cryptosystem. Steganography is an art and a science. in our previous research, we showed that we had been able to hid information in every bit of every byte in the cover without condition or restriction, and by extracting the complete hidden message with high complexity proportionate to the length of the cover and the number of position in the color values, and hiding the number of positions in the color values, and hiding the number of the sites in the color values. Our new research shows that the information hidden in the eighth position is not in a position with higher security than the first position because the Steganography I the first or eighth bit (as one it) of the cover has the same values of complexity. Our research also makes clear the integrity of the cover when hidden in Least Significant Bit (LSB) and Most Significant Bit (MSB). Read More Read Less

Abstract Natural Metaheuristics have been widely used to solve difficult optimization problems. This is mainly due to their ability to converge in reasonable time. However, they remain inefficient where handling large instances. Current research tends to improve these techniques in order to produce hybrid algorithms able to solve these problems. The encryption information has long been a challenge for cryptanalysis. It... Natural Metaheuristics have been widely used to solve difficult optimization problems. This is mainly due to their ability to converge in reasonable time. However, they remain inefficient where handling large instances. Current research tends to improve these techniques in order to produce hybrid algorithms able to solve these problems. The encryption information has long been a challenge for cryptanalysis. It was always attacked by classical techniques and heuristics but results are limited. In this paper, an approach of a PSO algorithm was proposed for cryptanalysis of classical encryption. After comparison with other heuristics in the same category, we show experimentally the superiority of PSO on the instances tested and underline the difficulties encountered. Read More Read Less

Abstract broadcast nature of wireless medium makes multicast communication subject to various challenges, especially, the unreliability due to the interference [2] and the impact of the transmission data rate choice on the conflicts between communicating users. In fact, a fundamental trade-off exists between communication speed (transmission data rate) and communication range. Actually, the effect of interference is more important when the... broadcast nature of wireless medium makes multicast communication subject to various challenges, especially, the unreliability due to the interference [2] and the impact of the transmission data rate choice on the conflicts between communicating users. In fact, a fundamental trade-off exists between communication speed (transmission data rate) and communication range. Actually, the effect of interference is more important when the communication speed decreases, i.e. when communication range increases. In this paper, we propose a multiple rate multicast scheme that is applied to capture the effect of transmission conflicts on the wireless multicast throughput. This work exploits the diversity between users to provide an accurate and efficient method that enables each multicast transmitter, i.e. forwarder or sender, to select the data rates to use to serve its interested neighbours. The choice of the set of data rates, or choice of multi-rate multicast scheme, should be conflict sensitive in order to guarantee high multicast throughput in multi-rate multi-hop MANET’s. We start by introducing two new concepts: The transmission data rate based interference graph (TRIGraph) and concurrent multi - rate multicast transmitter set (CMMS). Then, we describe the use of these concepts to characterize the interference conflicts caused by multi-rate multicast transmissions. Unlike all the existing conflict graphs, TRIGraph and CMMS are not only used to model interference conflicts, but they are also used to choose the multicast data rates that reduce the effect of such network inconsistency on the system performance. Read More Read Less