الفهرس 
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Abstract
The chosen topic areas for this research consist of an overlap of three new growing
information technology areas. The First area is cloud Computing (CC), the second
area is Smartphone and mobile computing, the third area is cryptography and network
security.
Cloud computing is a style of computing in which dynamically scalable and
often virtualized resources are provided as a service over the Internet. The objectives
of cloud computing are to increase capacity and capabilities at runtime without
investing in new infrastructure, licensing new software, and training new recruits. The
services may be Infrastructure as a Service (IaaS), Data storage as a Service (DaaS),
Hardware as a Service (HaaS), Software as a Service (SaaS),and Platform as a Service
(PaaS). There are many benefits of cloud computing such as it can be less expensive
compared to buying software and hardware, it can be used from any computer or
device with an Internet connection , The device does not need as large of an internal
storage system , Compatible with most computers and operating systems.
On the other side, Mobile devices (e.g., smartphone, tablet pcs, etc) are
increasingly becoming an essential part of human life, Dream of ―Information at your
fingertips anywhere anytime‖.These Mobile devices still lack in resources compared
to a conventional information-processing device such as PCs and laptops. The solution
to overcome of these challenges is Mobile Cloud Computing (MCC).
The aim of this thesis is to investigate if the cloud can be used to execute
mobile phone application functions faster by offloading the task to the cloud, in
comparison to execute the function on the mobile phone.
We propose a new elastic application model that enables transparent use of
cloud resources to augment the capability of resource constrained mobile devices. The
significant features of this model include the partition of a single application into
multiple components. Mobile applications can be executed in the mobile device
(known as mobile execution) or offloaded to the cloud clone for execution (known as
cloud execution).
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The results shows that the performance of execute application on mobile or
cloud in terms of memory consumed using different distance and number of points are
concluded. The most of resources consumed on mobile smartphone will decrease
approximately to the half of memory consumed for running application on the mobile
only.
Although Cloud Computing is a great innovation in the world of computing,
there also exist downsides of cloud computing. These challenges are Lack of standard
, Security & Privacy of data on the cloud, check availability of data on the
cloud.
For the first problem, it is very difficult for the customers to switch from one
Cloud Service Provider (CSP) to another. This problem is out of scope of our
research.
For the second and third problem. Security is very essential for applications
where the sensitive data transmitted.
Therefore, there is a great need of encryption method with high levels of
security and with minimal key size. There for, the main target for ensuring security is
to developed new hybrid cryptography protocol. This new security protocol using
combination of both symmetric and asymmetric cryptographic techniques is proposed
by merging both symmetric and asymmetric techniques by a way that avoids the
disadvantages of the existing hybrid protocols.
The proposed hybrid cryptography protocol developed for achieving security in
Mobile Cloud Computing. This protocol applied on one type of wireless sensor
network (Zigbee) to be evaluated and compared it with other four-hybrid
cryptography protocol. The performance includes time of encryption and decryption
process, size of cipher text, power consumption in zigbee sensor network and
throughput
The results show the superiority of the proposed hybrid cryptography protocol
over other algorithms in terms of the encryption and decryption time, processing time,
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VII
and throughput (when we encrypt the same data by using different five protocols, we
found that proposed hybrid cryptography protocol requires approximately 25% of the
time which is consumed for the least of other four protocols).
In addition, we implements new hybrid cryptography protocol on our Mobile
Cloud Computing applications in many cases.
The results show that resources consumed on mobile for getting points and
calculation will decrease in case of partition and offloading application to cloud using
hybrid cryptography protocol and AES/RSA cryptography protocol.
Key Terms:
Cloud Computing, Mobile Cloud Computing, Global Position Systems (GPS),
Cryptography and Network Security , Hybrid Cryptography Protocols, AES, ECC,
RSA, and RC6.