QoS Aware Adaptive Security Scheme for Video Streaming in MANETs - - PowerPoint PPT Presentation

5th International Symposium on Foundations & Practice of Security

October 25 - 26, 2012, Montreal, QC, Canada

QoS Aware Adaptive Security Scheme for Video Streaming in MANETs

Tahsin Reza and Prof. Michel Barbeau School of Computer Scienece, Carleton University

Contents

• Problem overview
• Contributions
• Simulation results
• Conclusion and Future work

Problem overview

• Multimedia streaming in MANETs
• Confidentiality of video data –

Cryptography

• Overhead caused by cryptography affects

streaming performance

• Possibilities of selective encryption [1-3],

adaptive security [4,5], and properties of multimedia services

(These results are obtained from our earlier work [6]) Indices

Evaluation: Cumulative packet scheduling delay

Key contributions: Adaptive mechanisms

• 1. Fixed frame rate and adaptive crypto

scheme

• 2. Optional inter coded frame encryption
• 3. Optional inter coded frame transmission
• 4. Frame rate adaptation
• Crypto scheme:

• 1. Fixed frame rate and adaptive

crypto scheme

• Each station maintains a pre-populated

cryptography performance profile

(crypto scheme: encryption / decryption throughput)

• Receiver provides periodic feedback

(decryption throughput, packet rate, transmission delay)

• Crypto Threshold, (indicates the

maximum time allowed for a video data unit (slice, frame or a GOP) to spend in cryptography operations)

• Sender calculates crypto delay,
• If is not satisfied,

cypto scheme is changed to meet

Example: Cryptography performance profile

• 1. Fixed frame rate and adaptive

crypto scheme (continued)

Two ECDH based rekeying techniques:

• 1. Only the source renews its key – requires
• ne way communications
• 2. Both parties renew their keys – requires two

way communications

• 1. Fixed frame rate and adaptive

crypto scheme (continued)

36 Nodes | MP-OLSR | 802.11e | H.264/AVC [6]

5

• 1. Fixed frame rate and adaptive crypto

scheme (continued)

• 2. Optional inter coded frame

encryption

Crypto scheme and frame rate are fixed. Encrypting frames containing inter coded macroblocks (e.g., P and B-frames) are optional.

• 2. Optional inter coded frame

encryption (continued)

36 Nodes | MP-OLSR | 802.11e | H.264/AVC

• 3. Optional inter coded frame

transmission

• Crypto scheme is fixed and all the

transmitted video data must be encrypted.

• It is optional to encrypt and transmit video

frames containing inter coded macroblocks (e.g., P and B-frames).

• 3. Optional inter coded frame

transmission (continued)

36 Nodes | MP-OLSR | 802.11e | H.264/AVC

• 4. Frame rate adaptation

we replace TPdec in PKTfb by cumulative decryption time and considers cumulative encryption time as well and

• 4. Frame rate adaptation (continued)

36 Nodes | MP-OLSR | 802.11e | H.264/AVC @30 fps

Conclusion

Future work

• We have only considered H.264/AVC and
• unicasting. The concept can be extended for H.

264/SVC and 3D/Stereoscopic video coding and multicasting.

• An algorithm to determine the value of Crypto

Threshold based on network and application parameters.

• Using Multi Criteria Decision Making approach

(e.g., AHP) to realize multidimensional (e.g., adapting security and QoS parameters simultaneously) adaptation decisions.

References

[1] G. Spanos and T. Maples. Performance Study of a Selective Encryption Scheme for the Security of Networked, Real-Time Video. Fourth International Conference

• n Computer Communications and Networks, pages xviii+683, September 1995.

[2] J. Meyer and F. Gadegast. Security mechanisms for Multimedia data with the Example MPEG-1 video, Project description of SECMPEG. 2000. [3] L. Tang. Methods for encrypting and decrypting MPEG video data efficiently. In Proceedings of the fourth ACM international conference on Multimedia (MULTIMEDIA), pages 219{229, New York, NY, USA, 1996. ACM. [4] R. Iqbal, S. Shahabuddin, and S. Shirmohammadi. Compressed-domain spatial adaptation resilient perceptual encryption of live H.264 video. In 10th International Conference on Information Sciences Signal Processing and their Applications (ISSPA), pages 472{475, May 2010. [5] M. Ben Mahmoud, N. Larrieu, A. Pirovano, and A. Varet. An adaptive security architecture for future aircraft communications. In IEEE/AIAA 29th Digital Avionics Systems Conference (DASC), pages 3.E.2{1{3.E.2{16, October 2010. [6] T. Reza. QoS Aware Adaptive Security Scheme for Video Streaming in MANETs. Master's thesis, School of Computer Science, Carleton University, Ottawa, Ontario, Canada, 2012. http://people.scs.carleton.ca/~barbeau/Theses/Tashin_Reza.pdf.

Questions?

Thank You!