Data security has got to be amongst the most vital worries of the aggregate data innovation improvement process. So network security is the subject which is applicable anywhere in the business world. To enhance the reliability of these networks, many methods had been introduced. Diffie-hellman is a technique based on public key symmetric algorithm utilized for secret key sharing between two users over the open channel for communication. When attacks come from eavesdropper Diffie-Hellman becomes brittle. Authentication is not provided by Diffie-Hellman algorithm adding to which security of this algorithm totally relies on arbitrary prime number chosen by the client. It is problematic to solve private key after getting the public key and a prime number. RSA is a cryptography which is usually used for the encryption and decryption. RSA depends on the fact that it is difficult to find the factors of large integers. RSA is a procedure consisting three stages of key generation, message encryption, and message decryption. In this paper, the combined cryptography algorithm is proposed for message exchanging using a secret shared key, which will be used in RSA algorithm to modify the value of N to avoid the mathematical attack. © 2016, International Journal of Pharmacy and Technology. All rights reserved.