Proposed Model of Block Based Symmetric Cipher

This paper is presenting cryptography model of block based cipher technique. This model is divided into two sub model one is encryption model and other is decryption model. Using encryption model, encrypt any type of data like text, image, pdf, audio. Using decryption model, decrypt same data. Due to the simplicity of the proposed model, it is very efficient. This model is also much secured due to key length which is used at the time of encryption and decryption. The Proposed model is using 256 key lengths. The proposed model applied the basic computing operations to design model in this study. The Proposed model used the inserting dummy symbols, XOR, Shifting like right circular shift and left circular shift and inserting control byte to build the data in the proposed model of encryption and decryption. These operations are simple and easily to implement. Without knowing the data, it is difficult to do cryptanalysis. In the decryption model, it used these data to decrypt cipher text to plaintext. The Proposed model easily applies these two models to transmit data in network and the data transmission is secure. Keywords— Information security, Encryption, Decryption,