Research on Cryptography and Access Control-Based Secure Storage in Cloud focuses on protecting sensitive data through robust encryption techniques and fine-grained access management mechanisms. Modern approaches combine symmetric and asymmetric cryptography, attribute-based encryption, and blockchain-enabled frameworks to ensure confidentiality, integrity, and controlled data sharing among authorized users. Hybrid cryptosystems integrate lightweight encryption algorithms with efficient key management to balance security and performance, while decentralized access control models leverage smart contracts and digital identity verification to eliminate single points of failure. Recent developments emphasize integrating cryptography with policy-based and role-based access control for dynamic, scalable, and auditable cloud environments. These techniques collectively enhance trust, accountability, and resilience in secure cloud storage systems, enabling secure data exchange across distributed and multi-cloud infrastructures.