Due to the increase of cybercrime and security risks in computer networks as well as violations of user privacy, it is essential to upgrade the existing protection models and provide practical solutions to meet these challenges. An example of these risks is the presence of a third party between users and various services, which leads to the collection and control of large amounts of users' personal information and the possibility of their databases being misused or hacked. Blockchain technology and encrypted currencies have so far shown that a decentralized network of peer-to-peer users, along with a general ledger, can do reliable computing. So, in this article, we are going to introduce a protocol that converts the blockchain network to an automated access control manager without the presence of a third party. To this end, we designed a mutual authentication protocol to create a secure channel between the user and the service and then demonstrate its accuracy and completeness using the Gong-Nidham-Yahalom belief logic [1]. The results of our evaluations show that our proposed protocol is secure enough to be used on the blockchain network and attackers are unable to penetrate, track, impersonate, inject, misrepresent or distort information using the common attacks.

Abstract-For decades, the structure of existing power grids has not changed. It is an old structure that depends heavily on fossil fuel as an energy source, and in the future, this is likely to be critical in the field of energy.To solve these problems and to make optimal use of energy resources, a new concept is proposed, called Smart Grid. Smart Grid is an electric power distribution automation system, which can provide a two-way flow of electricity and information between power plants and consumers.The Smart Grid communications infrastructure consists of different network components, such as Home Area Network (HAN), Neighborhood Area Network (NAN) and Wide Area Network (WAN). Achieving the required level of reliability in the transmission of information to all sections, including the HAN, is one of the main objectives in the design and implementation of Smart Grid. This study offers a routing protocol by considering the parameters and constraints of HAN, which, by improving AODV routing protocol, achieves the level of required reliability for data transmission in this network. These improvements include: making table-driven AODV routing protocol, extending the routing protocol to compute multiple paths in a route discovery, simplification and providing the effect of HAN parameters. The results of the NS2 simulation indicate that applying this improved routing protocol in the HAN, satisfies the required level of reliability of the network, which is over 98%.

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