The main emphasis for the development of this software project is to secure sensitive messages. In our daily life it is very important to send sensitive message securely. Message can be secured by using encryption technique. There are a lot of technique used for data encryption and decryption like ACK, AES, AKA, CBCM, CHAP, DES and RSA. However RSA (which stand for Rivest, Shimmer and Adleman who first publicly describe it) will be used. RSA technique uses the concept of private and public keys. System will produce unique public and private keys for the message. Public key is visible to every one but private key is secret key. One the other end receiver will decrypt the message using public and private key.