There are several security measures to protect the sensitive, confidential and secretive data over the internet. One of the basic mechanism is to apply a secret code of encryption. The basic problem with encryption has been speed, the reliability of mechanism and the compatibility with different web browsers. We have several encryption algorithms like RSA, IDEA, TEA and DES. These algorithms are developed by different people and written in many forms i.e. in different programming languages. Here we are proposing a model of stream cipher based on encryption techniques with digital adder’s operation. The text is translated into hex code using some secret key (say password). The secret key is only shared by sender and receivers. So only authorized personnel can access the data sent. Our model proposes to use n-bit serial adder to encrypt data with fast speed and high reliability. The encrypted data are converted into hexadecimal to enhance the compatibility of the proposed mechanism with different machines and platforms. We have performed an analytical analysis to determine the best working algorithms for text web browser.