Design and Implementation of Dynamic Secure Storage Algorithm Based on MongoDB and Blockchain

The combination of blockchain technology provides an innovative solution to the widespread application and critical security challenges of big data in the current digital era. Therefore, this paper proposes a novel blockchain-based secure storage strategy for unstructured big data, which utilizes blockchain's distributed ledger technology to ensure the integrity and traceability of data storage, and strengthens the security protection of the data in the transmission and storage process by employing advanced encryption algorithms, such as asymmetric encryption and hash functions. Finally, we use MongoDB in conjunction with blockchain technology to realize a system architecture aimed at enhancing data confidentiality and tamper resistance through efficient encryption techniques.