Abstract: RSA algorithm is one of the modern cryptography systems that based on asymmetric key encryption algorithms. In this research, we used a Three-Pass Protocol (TPP) method with the (RSA) cryptosystem by combining them, this combination allows senders and the receivers to exchange the messages securely without need to send a public key (e) for them because the proposed combination protocol has this property, so, the integration security of the RSA algorithm is improved. In addition, the implementation of this research shows that the security is improved and it’s more efficient comparing with the traditional RSA cryptosystem.