Internet of Things (IoT) is an emerging technology and its applications are flattering amidst many users, as it makes everything easier. As a consequence of its massive growth, security and privacy are becoming crucial issues where the IoT devices are perpetually vulnerable to cyber-attacks. To overcome this issue, intrusion detection and mitigation is accomplished which enhances the security in IoT networks. In this paper, we proposed Blockchain entrenched Bi-level intrusion detection and graph based mitigation framework named as HybridChain-IDS. The proposed work embrace four sequential processes includes timebased authentication, user scheduling and access control, bi-level intrusion detection and attack graph generation. Initially, we perform time-based authentication to authenticate the legitimate users using NIK-512 hashing algorithm, password and registered time are stored in Hybridchain which is an assimilation of blockchain and Trusted Execution Environment (TEE) which enhances data privacy and security. After that, we perform user scheduling using Cheetah Optimization Algorithm (COA) which reduces the complexity and then the access control is provided to authorized users by smart contract by considering their trust and permission level. Then, we accomplish bi-level intrusion detection using ResCapsNet which extracts sufficient features and classified effectively. Finally, risk of the attack is evaluated, and then the attacks graphs are generated by employing Enhanced k-nearest neighbor (KNN) algorithm to identify the attack path. Furthermore, the countermeasures are taken based on the attack risk level and the attack graph is stored in Hybridchain for eventual attack prediction. The implementation of this proposed work is directed by network simulator of NS-3.26 and the performance of the proposed HybridChain-IDS is enumerated based on various performance metrics.

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This study presents an investigation and comparing of all methods used in E-commerce security. Also it presents suggested methods to make e-commerce more secure. Applications of the E-commerce are demonstrated here. The efficiency of the security methods are measured and such efficiency increases as we combined more security methods with each other. A new method of security is suggested which is a combination between hash algorithm and Public Key Infrastructures (PKI). Index term-public Key Infrastructures (PKI), hash algorithm, E-commerce, security.

This paper construct a comparison between two main software’s used in programming applications that are Java and C++, the comparison operation includes the time needed to perform some algorithm i.e. speed of operation, flexibility to adjusting some code, and efficiency. The same code is used to compare between the two software to determine which one is better. It is found that C++ needs less time to execute the same code comparing with Java. Java needs about 10% excess time to execute the same code segment comparing to C++