Mahmoud R. El-Sakka "A Novel Protocol Under A Priority Time
Constraint for Real-Time Communication Systems", M.Sc.
Dissertation, Computer Science Department, Faculty of
Engineering, Alexandria University, Egypt, 1990.
Computer networks have a tremendous effect on our society and
economy. The influence of this effect has had a greater impact
than any other major development of the past. Local
Area Networks (LANs) are a specific case of computer networks
that are limited in geographic scope. They provide high
bandwidth over inexpensive transmission media.
The field of multiple-access communication has developed major
practical and theoretical interest within the computer
communication community. The multiple-access problems
arise from the necessity of sharing a single communication
channel among a community of distributed users. The
distributed algorithm used by the stations to share the
channel, is known as the multiple-access protocol.
In data communication networks, there are different kinds of
applications. Some of them demand very quick response
times and the requirement for meeting specific deadlines is
needed. There are also other applications that are able to
tolerate longer delays. In such cases, the protocols that
handle the packet-base priorities and the time constraint are
In this thesis, a novel protocol under a priority time
constraint for a real-time communications system is suggested
and evaluated. The main goal of this protocol is to
reduce the ratio of lost packets due to reaching their
Keywords: digital watermarking, image authentication, digital
signature, cryptography, ECC elliptic curve encryption, RSA
encryption, MD5 Hashing, SHA-1 Hashing.