M.Sc.

The work presented here describes a web-based digital library system for Iraqi universities. This system is capable of executing the search function of digital libraries. Library information is present in centralized database which is collected from different library systems of Iraqi universities and it provides their access through website.The system utilizes MySQL database to store the collected data from library systems in Iraqi universities. Web technology is used for accessing library data by using HTML & PHP. Apache server is also used.

Steganography is considered one of the widely used methods for hiding information; it hides secret data in digital cover without clear suspicion.This work focus on studying two methods for hiding any secret data type in the audio signal. First, the audio signal is transformed to frequency domain by using quick Fourier transform that depended on the reduction of time and number of mathematical operations.        Two hiding methods are designed to embed secret data bits in the phase domain coefficients of audio signal.

 Instant messaging system is considered to be one of the widely used application area, it is rapidly growing as a primary communications technology among corporate, educational and home users.  Users of instant messaging systems need to authenticate each other before communicating, so the need for login authentication becomes an important issue.This research deals with the design and implementation of instant messaging system (IMS) supported with a suggested method to authenticate users.