Research on Cryptography and Key Management Strategies in Cloud Computing focuses on developing secure and efficient methods to protect data confidentiality, integrity, and access control in cloud environments. Modern approaches integrate symmetric and asymmetric encryption schemes, hybrid frameworks like ECC-AES, and advanced key management systems to safeguard sensitive information. Cloud service providers and frameworks such as AWS KMS offer centralized and decentralized solutions for key generation, distribution, rotation, and revocation, while emerging trends in post-quantum cryptography and threshold cryptography enhance resilience against future threats. Overall, these strategies ensure secure data storage, transmission, and access in multi-tenant, distributed, and blockchain-integrated cloud infrastructures, providing robust protection against evolving cyberattacks.