The authors have two types of encryption algorithms symmetric and asymmetric. Symmetric algorithm is encryption and decryption with same key. Asymmetric is encryption and decryption with different keys, like private key and public key. In their proposed algorithm, encryption is performed using substitution matrix and double point crossover. They require two different keys for encryption and decryption. First substitution generates intermediate cipher from plaintext. Then double point crossover is going to perform on intermediate cipher to get final cipher text.