Big data in computer networks is increasingly large and complex. This study proposes the RBJ20 cryptographic algorithm using an N×N matrix with four layers to provide security and authentication for unstructured data. Layers include column operations, secret key multiplication, prime number-based quadratic equations, pairwise cell swapping, and additional transformations. The method ensures secure storage and communication of big data, overcoming limitations of traditional security systems. © 2021 Elsevier B.V., All rights reserved.