Text encryption and decryption with extended euclidean algorithm and combining the features of linear congruence generator

Security plays a vital role in our communication system through internet.  For this reasons, we protect data from unauthorized users using appropriate encryptions algorithm. Using encryption we convert plain text to cipher text using our proposed secret key and similarly using inverse key we can decrypt the original text. In this algorithm, we read a string, then extract each of the single characters from the string and convert these characters to ASCII equivalent value. Apply proposed secret key, along with ASCII value and appropriate encryption algorithm we encrypt the text. Similarly, using the inverse key along with appropriate decryption algorithm we can decrypt the original text.