A review of Smart Contract Blockchain Based on Multi-Criteria Analysis: Challenges and Motivations

A smart contract is a digital program of transaction protocol (rules of contract) based on the consensus architecture of blockchain. Smart contracts with Blockchain are modern technologies that have gained enormous attention in scientific and practical applications. A smart contract is the central aspect of a blockchain that facilitates blockchain as a platform outside the cryptocurrency spectrum. The development of blockchain technology, with a focus on smart contracts, has advanced significantly in recent years. However research on the smart contract idea has weaknesses in the implementation sectors based on a decentralized network that shares an identical state. This paper extensively reviews smart contracts based on multi criteria analysis challenges and motivations. Therefore, implementing blockchain in multi-criteria research is required to increase the efficiency of interaction between users via supporting information exchange with high trust. Implementing blockchain in the multi-criteria analysis is necessary to increase the efficiency of interaction between users via supporting information exchange and with high confidence, detecting malfunctioning, helping users with performance issues, reaching a consensus, deploying distributed solutions and allocating plans, tasks and joint missions. The smart contract with decision-making performance, planning and execution improves the implementation based on efficiency, sustainability and management. Furthermore the uncertainty and supply chain performance lead to improved users confidence in offering new solutions in exchange for problems in smart contacts. Evaluation includes code analysis and performance while development performance can be under development.Comment: Revie

Suitability of adopting S/MIME and OpenPGP email messages protocol to secure electronic medical records

Security of Electronic medical records is one of the everyday concerns to the decision makers, governmental agencies, researchers and medical centres. Several funding agencies spend thousands or millions dollars to initiate new project aims to preserve the privacy of the patients and maintain the confidentiality of the EMR, the results of these projects developed several EMR security solutions. However, there are several (well-designed and standardized) security solutions developed for other applications such OpenPGP and S/MIME protocols that were originally developed for Email. OpenPGP and S/MIME protocols employ different architecture and algorithms to secure the email transmission. In this paper, a systematic review and analysis of both protocols OpenPGP and S/MIME is done. The result of analysis depicted that, the adoption of both protocols is applicable. In addition some suggestions are proposed to integrate different medical centres in order to achieve secure message exchange

Secure PIN-Entry Method Using One-Time PIN (OTP)

The regular PIN-entry method has been still the most common method of authentication for systems and networks. However, PINs are easy to be captured through various attacks, including shoulder-surfing, video-recording, and spyware. This could be attributed to the involuntary nature of entering the original PIN during authentication. In this paper, we employ an indirect input method that utilizes the addition mod 10 and a mini-challenge keypad in order to produce a one-time PIN (OTP) that obscures the original PIN. The results of our user study manifest that the proposed PIN-entry method provides better security than the existing PIN-entry methods while maintaining an acceptable level of usability. Moreover, the user feedback fully support the use of the proposed PIN-entry method in critical-security situations