Conference Papers
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Item Towards a Secure Electronic Health Record System using Blockchain Technology(Institute of Electrical and Electronics Engineers Inc., 2021) Bhattacharyya, S.; Chandrasekaran, K.Blockchain has emerged as a key technology for ensuring reliability and security in several application areas primarily including the healthcare sector. Blockchain is a distributed ledger where blocks of transactions are connected in a chain using the cryptographic hash function of the previous block, making it an append-only structure. Any modification on any of the blocks will generate different hash values in other blocks in a cascading manner and different link relations. In this way the blockchain achieves immutability and security. Blockchain also involves consensus mechanisms in order to ensure synchronization among blocks and agreement between existing nodes to add a new transaction in the chain. Healthcare data is highly sensitive in nature, which consists of private information related to the diagnosis and treatment of patients. In traditional approach these data are stored by each hospital separately where sharing data is very time consuming. Also, health data is very limited to access due to the risk of disclosure of sensitive information. In order to address these issues, the objective of this paper is to integrate blockchain technology with healthcare records/data in order to provide better sharing of data without the fear of data tampering or security breach. © 2021 IEEE.Item Enhancing Security in Smart Contract Wallets : An OTP Based 2-Factor Authentication Approach(Association for Computing Machinery, Inc, 2025) Kalash; Ghosh, B.C.; Addya, S.K.As cryptocurrencies have gained widespread popularity, the security and handling of crypto-assets have become increasingly crucial. Numerous attacks targeting both users and blockchain platforms have led to substantial financial losses. This paper proposes a system for 2-factor authentication (2FA) for smart contract wallets, providing users with a flexible, secure, and customizable way of managing their crypto assets. The proposed methodology utilizes cryptographic hash functions and hash chains to generate One-Time Passwords (OTPs) for authentication, ensuring protection against unauthorized access. The 2FA setup involves a client interacting with a smart contract along with an authenticator and software wallet while using the public-private key pair of wallet as the first factor, and OTPs as the second factor. This is done through a two-stage protocol for bootstrapping and operation execution, and offers a level of security similar to traditional authentication schemes like HOTP. Using a novel pre-commitment scheme we also defend the users from front-running attacks. The implementation of the system is done in the context of public blockchain evaluating the practicality and effectiveness of the 2FA model. We open source our implementation for the Ethereum platform and make it available for the community. Furthermore, we analyse the cost incured based on gas consumption, space requirements and payload. In addition we suggest future enhancements for shorter OTP lengths and time based OTPs. © 2025 Copyright held by the owner/author(s).