Abstract

Abstract: In the swiftly evolving landscape of cryptography, the advent of quantum computing poses unprecedented challenges to the established security paradigms. This research embarks on an extensive exploration into the resilience of the SHA-256 hashing algorithm, a linchpin of contemporary cryptographic infrastructure, against the looming threat posed by quantum computers. Our principal aim is to comprehensively assess the susceptibility of SHA-256, especially within the context of its critical role in ensuring the security and immutability of the Bitcoin blockchain. As quantum computing's potential to break classical cryptographic systems becomes a tangible concern, this research proposes SPHINCS+ as a potent post-quantum alternative, capable of safeguarding digital transactions and communications in the quantum era. By delving deep into the inner workings of both SHA-256 and SPHINCS+, this research contributes significantly to the expanding knowledge base surrounding post-quantum cryptography and its implications for securing the digital landscape

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