Cloud computing represents a transformative advancement in modern technology. However, as it evolves, so do the security threats faced by users. This has made safeguarding data during storage and transmission a growing concern. Traditional cryptographic methods are increasingly susceptible to sophisticated attacks, prompting the exploration of alternative techniques. One promising direction is the use of DNA and RNA-based cryptography, which offers the potential for highly secure encryption. Numerous researchers worldwide have proposed methods to enhance cloud data protection. In this study, a novel encryption algorithm is introduced that merges arithmetic operations with biological concepts. It employs biological mechanisms to generate symmetric keys by converting DNA sequences into RNA sequences. Encryption is achieved through XOR operations, integrating biological principles into digital computing. This approach leverages the natural efficiency of biological systems—particularly their capabilities in parallel processing and dense data storage—which remain underutilized in conventional computational methods.