Sharif Digital Repository

Increasing use of new data technologies have made data collection possible in large scales. Practicallity of the data relies upon the extraction of meaningful knowledge.Data mining is a solution to this problem. One of the new areas in data mining is consideration of the concern of privacy alongside the usefulness of the mining results.Main goal of privacy preserving data mining is to develop data mining models which only extract the useful knowledge. In recent years, many researches have been done in this area. Since the literature and notation of these published works vary, a survey would help to better understand these concepts. This thesis tries to explain, analyse,unify and categorize... 

With the help of cloud computing, easy and fast access to a wide range of computing resources through the network is provided for a wide range of users. Cloud computing, on the other hand, faces security challenges in protecting users' privacy and access control because the cloud service provider is not a trusted entity, so it is possible to access or disclose sensitive data. Various solutions have been proposed to simultaneously meet the above two security requirements. The most well-known solution in this field is "Attribute-Based Encryption".In this dissertation, after reviewing the existing schemes to respond to the obstacles to implementing attribute-based encryption, an attribute-based... 

Recent advances in Machine Learning and specially Deep Learning, have caused a dramatic increase in the use of these algorithms in different applications, such as sickness diagnosis, anomaly detection, malware detection, and etc. Since training deep neural networks requires a high cost in terms of both gathering loads of labeled data and computing and human resources, deep learning models are a part of an organization’s intellectual property and so, the importance of securing these models is increasing. One of the most important types of attacks that compromises the security of deep neural networks is black-box adversarial example attack. In adversarial example attacks, the adversary... 

With the dramatic advancements in information technology and the industry requirements for security and privacy, proof systems play a crucial role in cryptography. Among the vast variety of proof systems, succinct non-interactive arguments (SNARG) seem to be the most appealing class of proof systems, due to their attractive properties. SNARGs are usually made up of two constructive components, namely the information theoretic part and the cryptographic part. The GKR protocol was introduced as a proof system for a tractable family of languages called “log-Space Uniform Circuits”. The log-space uniformity is a necessary condition for the protocol to be succinct. Hence, it is not possible to... 

With the dramatic advancements in information technology and the industry requirements for security and privacy, proof systems play a crucial role in cryptography. Among the vast variety of proof systems, succinct non-interactive arguments (SNARG) seem to be the most appealing class of proof systems, due to their attractive properties. SNARGs are usually made up of two constructive components, namely the information theoretic part and the cryptographic part. The GKR protocol was introduced as a proof system for a tractable family of languages called “log-Space Uniform Circuits”. The log-space uniformity is a necessary condition for the protocol to be succinct. Hence, it is not possible to... 

The applications of Internet of Things technology are increasing day by day. In the Internet of Things, various devices are connected to each other with the help of the Internet and perform various operations automatically. Today, this technology has various applications in smart city, smart home, smart car, as well as military industries and industrial factories. One of the newest applications is its use in the field of health and hygiene, which is known as the Internet of Medical Things or Smart Health. With the emergence of new epidemic diseases, the importance of this application becomes more clear. Smart health helps the patient. without going to the hospital and doctor in person, to...