Abstract:
Short Message Service (SMS) is a text messaging service component of
mobile communication systems. It uses standardized communications protocols to
exchange short text between mobile devices. SMS does not have any built-in
procedure to offer security for the text transmitted as data. Most of the applications
for mobile devices are designed and developed without taking security into
consideration. As confidentiality is the original purpose of cryptology, the proposed
system is introduced a data confidentiality approach to SMS on Android. It includes
SMS network architecture as well as cryptographic protocols as theory background
and it also deals with design, implementation and confidentiality assessment of RC4
stream cipher for SMS data confidentiality on mobile networks. In practical use, SMS
messages are not encrypted by default during transmission. To secure the message,
the receiver needs to put password. In the thesis, RC4 stream cipher is implemented
by using Key-Scheduling Algorithm (KSA) and Pseudo-Random Generation
Algorithm (PRGA) in Java programming language.
