Mohammed Alani Blog

Final Exam Review

Dear Students,

The following two files contain descriptions about your assignments. Please email the solutions to before 24-12-2010.

Access-List Assignment

NAT Assignment

Good Luck.

Dr.Mohammed

Dear Students,

Please download this file to find your assignment's description. Remember that the delivery date is 22-12-2010. The assignment should be delivered in hard-copy. No electronic submissions are allowed for this assignment.

Regards,

Dr.Mohammed

Write a report (5-10 pages) and a presentation about a website that is an example of electronic commerce. Write about your experience with this website in terms of:
1. How did you hear about it?
2. What are the site statistics (use info from alexa.com)?
3. Is the site easily accessible?
4. Did you find what you were looking for easily?
5. Does the site have adequate information regarding the product?
6. Is the site secure?
Etc.

The choices of websites can be found in this file.

The delivery and presentation date is Monday December 20th, 2010.

Dr.Mohammed

Dear Students,

There will be a quiz on the forthcoming lecture on Wed., December 8^th, 2010. The subject of the quiz is Functions and Algorithms (Chapter 3).

Regards,

Dr.Mohammed

ABSTRACT

This paper focuses on the quality parameters of Voice over Wireless Local Area Network (VoWLAN) and how they are affected by the addition of end-to-end encryption using Advanced Encryption Standard (AES) of 128-bits and 256-bits block sizes. An experimental setup was made to evaluate mean and maximum delay and jitter, and packet loss. These quality parameters were measured for non-encrypted streams, AES 128-bit encrypted streams, AES 256-bit encrypted streams for the CODECs; G,711, G.729, and G.723.1. The encryption was applied to Real-time Transport Protocol (RTP) payload. The tests showed that encryption affects the delay noticeably for high-bit-rate CODECs, such as G.711. G.729 streams delay was less affected, and the delay of G.723.1 streams was even less affected. Jitter and packet loss were not highly affected by the addition of encryption. The results also showed that 256-bit AES encryption causes less delay despite the fact that it needs longer calculations that the 128-bit AES. This is due to the fact that larger block size causes less number of repetitions to encrypt a complete payload field of an RTP packet. It was also concluded that the use of G.723.1 with AES encryption is more recommended in VoWLAN because it has better quality measures.

Index Terms – aes, voip, rtp, qos, delay, jitter

Citation Information:

Mohammed M. Alani, Measuring the Effect of AES Encryption on VoWLAN QoS, Proceedings of the 18^th International Conference on Software, Telecommunications, and Computer Networks (SoftCOM2010), Split, Croatia, September 2010.(IEEE Xplore)