Proposed method of combining text files : authentication and encryption

الملخص EN

This research concerns with proposing a method of combining the encryption and authentication in text files, So the research depended Symmetric encryption methods, transpositions methods, and substitution methods to provide text files security.

To provide authentication, a new method for calculating Hash functions was suggested to produce a message digest.

The goal of this work is to detect any intrusion activities which includes disclosure, insertion, deletion, and rearranging of the text file while sending through computer's networks.