Short Message Service (sms) security solution for mobile devices

b. Software 
Development 
The development environment used was Visual Studio 2005, 
together with the Windows Mobile 5.0 Software Development Kit (SDK) for 
Pocket PC, as recommended by Microsoft [34]. ActiveSync 4.2 was also required 
for debugging and deployment of the solution to the mobile device. The 
programming language used was C#.
c. Performance 
Measurement 
Application 
Different approaches were tried to obtain accurate measurements 
of the performance data. However, due to the limitations imposed by resolution of 
power measurement in the API, and the failure in the State and Notification API 
(SNAPI), the approaches did not work. The details on the failed approaches are 
attached at Appendix A. In the final approach, the program flow is as shown in 
Figure 14.
The encryption process uses Microsoft’s implementation of 
RijndaelManaged and the RSA algorithms in the Microsoft CryptoAPI (CAPI). 
The program code is attached at Appendix A. The performance measurements 
for One Time Pad operations are not measured because the mathematical 

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operation of OTP is very simple, comprised by a few XOR functions. Therefore, 
the time and power consumption requirements are assumed to be significantly 
lower than symmetric encryption.
Start
Log data
Read Clear 
Text Input
Set Number 
of Iterations
Check battery 
level
Record Start time
Generate
Key Pair
End of loop?
End
No
Yes
Type of Encryption
RSA encryption
Record End time
Log data
Check battery 
level
Record Start time
Generate 
AES key
End of loop?
Yes
AES encryption
Record End time
Log data
Check battery 
level
Record Start time
End of loop?
Yes
Record End time
No
No
RSA
AES
Baseline
Figure 14. Flow Diagram for Performance Measurement Application 

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