This review article explores the role of encryption techniques in securing financial data in fintech applications. As financial technology (Fintech) continues to evolve, the need for robust data protection has become more critical. Encryption is a key method for ensuring the confidentiality, integrity, and availability of sensitive financial information. The article discusses various encryption techniques, including symmetric encryption (e.g., AES), asymmetric encryption (e.g., RSA, ECC), and hybrid encryption, which combine the strengths of both symmetric and asymmetric methods. End-to-end encryption (E2EE) is also highlighted for its role in protecting data during transmission. Additionally, homomorphic encryption is noted for enabling secure data analysis without decryption, which is particularly useful in fintech environments. The article emphasizes the importance of encryption in securing communication channels, data at rest, and ensuring the privacy of financial transactions. It also addresses challenges such as key management, computational efficiency, and regulatory compliance. The future of fintech security is expected to be shaped by advancements in encryption technology, including post-quantum cryptography, artificial intelligence integration for adaptive security, and privacy-preserving solutions. These developments aim to strengthen financial data security in an increasingly connected digital world while mitigating evolving cyber threats. The study concludes that encryption is a foundational element of cybersecurity in fintech, playing a crucial role in protecting financial information, building user trust, and ensuring compliance with industry standards. As fintech continues to evolve, collaboration between academia, industry stakeholders, and policymakers is essential for research, innovation, and the adoption of robust encryption standards.This review article explores the role of encryption techniques in securing financial data in fintech applications. As financial technology (Fintech) continues to evolve, the need for robust data protection has become more critical. Encryption is a key method for ensuring the confidentiality, integrity, and availability of sensitive financial information. The article discusses various encryption techniques, including symmetric encryption (e.g., AES), asymmetric encryption (e.g., RSA, ECC), and hybrid encryption, which combine the strengths of both symmetric and asymmetric methods. End-to-end encryption (E2EE) is also highlighted for its role in protecting data during transmission. Additionally, homomorphic encryption is noted for enabling secure data analysis without decryption, which is particularly useful in fintech environments. The article emphasizes the importance of encryption in securing communication channels, data at rest, and ensuring the privacy of financial transactions. It also addresses challenges such as key management, computational efficiency, and regulatory compliance. The future of fintech security is expected to be shaped by advancements in encryption technology, including post-quantum cryptography, artificial intelligence integration for adaptive security, and privacy-preserving solutions. These developments aim to strengthen financial data security in an increasingly connected digital world while mitigating evolving cyber threats. The study concludes that encryption is a foundational element of cybersecurity in fintech, playing a crucial role in protecting financial information, building user trust, and ensuring compliance with industry standards. As fintech continues to evolve, collaboration between academia, industry stakeholders, and policymakers is essential for research, innovation, and the adoption of robust encryption standards.