Abstract: With the development of electronic communications RADG devices it has become increasingly important to protect data from violation, especially, large data. The main way to achieve this protection is using cryptography algorithms. Cryptography is the science of data encryption with the goal of reducing the availability of information to an analyst’s cipher. In this study, we propose a novel design, i.e., block cipher keys by attempting to develop one such algorithm, i.e., develop the RADG method to the BRADG block cipher key while keeping the RADG attributes. BRADG (Block cipher Reaction Automata Direct Graph) is used in protecting wireless networks. BRADG processes data blocks of B bits with key length of B bits and gives cipher text of size B bits where B is 64, 128, 512, ... , bits. BRADG is based on the unbalanced feistel structure in both encryption and decryption. In comparison to the previous design, ciphering of a new design is a faster and more efficient way to encrypt large data.