BLOCKCHAIN-BASED FRAMEWORK FOR SECURE AND EFFICIENT FINANCIAL TRANSACTIONS

Abstract

The increasing digitization of the banking sector has brought about significant advancements in customer service and transaction efficiency. However, this evolution has also introduced a range of security challenges, particularly concerning data privacy, transaction integrity, and vulnerability to cyber threats. Traditional e-banking systems, though efficient, are often susceptible to security risks such as phishing, malware attacks, and data breaches, which can compromise sensitive financial information and undermine customer trust. In response to these challenges, blockchain technology has emerged as a revolutionary solution that provides enhanced security, transparency, and decentralization, making it highly suitable for secure banking applications. This project, Secure Banking Using Blockchain, aims to explore the potential of blockchain technology in mitigating the security risks associated with online banking systems. By leveraging blockchain’s decentralized architecture, cryptographic principles, and consensus mechanisms, this research seeks to provide a more secure and transparent banking environment. The study begins by reviewing the current state of traditional e-banking systems, identifying their vulnerabilities, and analyzing the security methods currently implemented by banks. Surveys and archival data are utilized to understand customer and banker perspectives on adopting blockchain-based solutions, with security emerging as the core concern for both groups. The research further explores various categories of threats specific to both traditional and blockchain banking systems, such as phishing, hacking, Distributed Denial of Service (DDoS) attacks, smart contract vulnerabilities, and 51% attacks. A comparative study of existing security protocols in traditional systems (e.g., SSL, HTTPS) and blockchain mechanisms (e.g., encryption, digital signatures, consensus algorithms like Proof of Work and Proof of Stake) is conducted. The focus is on how blockchain’s immutable ledger, decentralized control, and cryptographic methods offer significant advantages in mitigating these threats. Two blockchain-based encryption algorithms are presented as part of the project. The first algorithm, NPN (Prime Numbers and Pseudo-Random Number Generator), combines cryptographic techniques to enhance the security of banking transactions by ensuring unpredictability and randomness in encryption keys. The second algorithm, LIE architecture, leverages a multi-round encryption process based on the Fiestel network, utilizing a set of discrete cryptographic subkeys and permutation matrices to provide robust data security. The LIE algorithm also applies the blockchain principles of confusion and diffusion to maximize the difficulty of data manipulation and enhance transaction integrity. Additionally, the research highlights the mathematical underpinnings of these algorithms, such as XOR operations, multiplication, and cryptographic hashing, which are critical to achieving essential properties like avalanche effects, statistical independence, and completeness. Both algorithms are designed to meet the stringent security demands of modern banking systems, ensuring that sensitive data remains secure during transactions. To validate the performance and effectiveness of the proposed algorithms, a comparative analysis is conducted with existing blockchain encryption methods. The time and space complexity of the designed algorithms are optimized and evaluated to ensure they are both efficient and scalable for real-world banking applications. The project concludes with recommendations for implementing blockchain-based security in modern banking systems, focusing on preventive measures to protect data from hacking, corruption, or unauthorized alteration. By proposing innovative cryptographic algorithms and optimizing their performance, this project contributes to the growing body of research on blockchain security in the financial sector and provides a practical framework for enhancing the security of online banking transactions.