نشریه نوآوری های فناوری اطلاعات و ارتباطات کاربردی
سال یکم شماره 1 (پیاپی -1، پاییز 1398)

Enterprise IT infrastructures endure a wide range of costs including software and hardware costs. However, the advent of cloud computing environments have provided a tangible perspective for reduce some of these costs. Software as a Service (SaaS) is type of services that provided by the cloud. It provide a new paradigm, which goal is to provide an effective and intelligent way to support end users’ on-demand requirements to computing resources. In this regard, multitenancy is one of the most important features of SaaS tier that due to increasing rate of resource utilization and decreasing overall cost of IT infrastructure by IT organization have been considered. Because of the emerging nature of this concept and the advantages which is offered by it, study of characteristics, related concepts and its challenges are important. This paper first introduces Multi-tenancy, features and related concepts and then examine technical layers and variety of date management approaches in multi-tenancy architecture and finally offers multi-tenancy's challenges and existing solutions in order to resolve theirs challenges.

The differences between textual and multimedia data, images for instance, the big size of images for one example and the correlation of adjacent pixels for another, have led to insufficient efficiency of traditional methods of cryptography and encrypting those data. This paper introduces a new method for image cryptography, using chaos mappings and 1D memory cellular automata. The method benefits from Piecewise linear chaos mapping in permutation phase and Logistic chaos mapping and cellular automata in broadcast phase. The outstanding characteristic of the introduced proposed algorithm is its capability of data verification in block level that holds a great weight in military and medical functions where image data or part of it is believed to be of great sensitivity. In this paper, the educational board of Cortex-M3 LPC1768 is served for hardware implementation of the proposed method. The results of different studies including key sensitivity assessment and statistical assessments depict the high level of the sensitivity of the proposed method. Furthermore, assessment of various attacks revealed the right level of resistance of the proposed method.

Information security is becoming an important proposition for most organizations due to the current process of transferring information through a world without borders and vulnerabilities. This has raised concerns and awareness of the use of ISRM to develop effective economic control strategies. Although there are several types of information security risk management tools that are readily available, most of the methods do the same, which results in the creation of a range of evaluation, information collection and intermediary information generation. the success of ISRM planning depends strongly on the quality of the input information, however, with the amount, variety and variety of information available to professionals, can easily be controlled with enhanced information. This article helps determine which dimensions of IQ contribute to the quality of information during the process of collecting information during the ISRM. To properly define, IQ dimensions are evaluated in terms of its production. To identify possible dimensions of information security risk management, Likert Online Structural Questionnaire was distributed among a group of senior and Ph.D. students at Gorgan University of Azad University who were engaged in accounting and auditing work (47 people). Partial least squares analysis (PLS) showed that the dimensions of accuracy, data rate, access to information, reliability of information, conciseness of data, completeness of information and reliability of information, relevance of information, reliability of information, timeliness of information, comprehensibility and Information uniformity significantly affects the quality of data collection on information security risk management

The hash function is a one-way function that converts a string of zero and one input with arbitrary length to a string of zero and one with a constant length n. The hash function should be fast, simple and one-way and resistant to collision attacks, Preimage and Second –Preimage. One of the most important applications of the hash function is digital signature. By using the hash functions, instead of entire signed message the signer first obtains the hash value of the message and then signs the value. This will increase the security and reduce the amount of computing. Cryptanalysis refers to all actions based on the principles of mathematics and science whose purpose is to eliminate cryptographic security and ultimately to unlock the code and access to the original information. Rotational cryptanalysis is one of the best and most recent attacks on ARX systems. In this paper, for the first time, we apply a rotational cryptanalysis and with Given the assumption of the Markov chain for the modular additions sequence employed in two algorithms SIMD and BMW, which are second-round candidates for the SHA-3 competition that use the ARX property in their structure. That for the BMW algorithm we arrived at the complexity of 2^(180ˎ68) for one round of 16-rounds and the complexity of 2^(101ˎ88) for the entire 16-round SIMD, according to the obtained results, it can be seen that due to the large number of modular additions As a Markov chain, the BMW algorithm exhibits greater resistance to the SIMD algorithm and Against the rotational cryptanalysis is has less likely to succeed.

Control systems based on internet are developing day by day. These systems are faced with many practical difficulties and challenges. Exchanged Information delay through the network is one of the most important issues of these systems and delay forecasting can make the user aware about the delays and missed data. As a result, the security system can prevent the cyber attacks. Predicting delays accurately, is a complex and difficult problem which has been studied by researchers, and several algorithms have been proposed to solve this problem. Artificial Immune System (AIS) and Particle Swarm Optimization (PSO) are two meta-heuristic methods based on stochastic search that has been developed to solve optimization problems. In this paper, the optimization model is presented. The AIS and PSO has been used as tools for optimization and the “Matlab” software has been utilized as a simulating tool to pridicting delays. In systems Comparing the results of AIS and PSO algorithm on the same data shows the efficiency and superiority of the AIS, both in terms of convergence speed and quality of response.

Today, cyberspace is an integral part of human life and is referred to as the second life. As in physical life, we need the rule and law, in this space, undoubtedly, we need rules that govern the social relations governing this living space. The process of formulating rules for such a space that has its own characteristics, with inevitable injuries In the written paper, the importance and necessity of regulating the cyber space (cyberspace) has been investigated and cyber-regulatory guidelines have been considered and the damages that threaten the process of regulation in the cyberspace of the Islamic Republic of Iran are cited. The results of the research indicate that considering the type of governance of the Islamic Republic of Iran which covers both the republican and Islamic countries, as well as the moral and national character of the ethics and human relations of the people of this country should be calculated in the base of its cyber space. And acted carefully. The main challenge and the damage to this field can be seen in the weakness of the coherence and coordination of the core institutions and the determinants of politics in this space.