As we all know the energy is one of the most important things in WSN, so decreasing WSN system complexity is one of the researchers goals , here is a powerful interleaving technique to achieve that.

1. Lower Complexity
of secured WSN
Networks
Realized by
AISSA BEN YAHYA

2. PLAN
Introduction
Error Control Scheme basics
Interleaving techniques
Cryptography using chaos
Chaotic interleaver
conclusion
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3. Introduction

4. Introduction
data-length complexity and the computational
complexity of processed data and error control
schemes, are essential points in system design
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5. Error control schemes

6. Channel Error
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7. Automatic Repeat Request
(ARQ)
Packet is retransmitted if it
is found to have errors.
Error control schemes
Forward Error Correction
(FEC)
FEC or channel coding is a
method used to increase
the performance of error
control
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8. Interleaving techniques

9. Interleaving techniques
 The interleaving idea is utilized to limiting the need
of complex error control schemes
 In addition to FEC it keeps the channel security
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10. Interleaving definition
 Interleaving is a periodic and reversible reordering of blocks of L
transmitted symbols
 Interleaving is used to disperse error bursts that may occur
because of non-stationary channel noise that may be localized
to a few dimensions
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11. Interleaving latency
 the latency parameter is defined as the difference
between maximum and minimum delay of the interleaver
𝑑 = 𝑑 𝑚𝑎𝑥 − 𝑑 𝑚𝑖𝑛
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12. Cryptography using
Chaos

13. The propertie of Chaos
Sensetivity to initial conditions (butterfly effect)
means that when a chaotic map is iteratively applied
to two initially close points, it iterates quickly diverge,
and become uncorrelated in the long term
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14. One Dimensional Chaotic Map
the logistic map is given by as:
𝑋 𝑛+1 = 𝑟𝑋 𝑛 (1 − 𝑋 𝑛)
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15. Two Dimensional Chaotic Map
The discretized map can be represented for an RxR matrix
as follows:
𝐵 𝑟1, 𝑟2
=
𝑅
𝑛𝑖
𝑟1 − 𝑅𝑖 + 𝑟2 𝑚𝑜𝑑
𝑅
𝑛𝑖
,
𝑛𝑖
𝑅
𝑟2 − 𝑟2 𝑚𝑜𝑑
𝑅
𝑛𝑖
+ 𝑅𝑖
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16. Place your screenshot here
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Chaotic encryption of an
8x8 square matrix
R = 8
The secret key
𝑆 𝑘𝑒𝑦 = 𝑛1, 𝑛2, 𝑛3 = 2,4,2

17. Chaotic interleaver

18. Row-Column
interleaver
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In this interleaver, data are written to
its memories row-by-row and then
read from them column-by-column

19. Chaotic interleaver
In the following, the two dimensional
chaotic Baker map based is utilized as
an efficient interleaving technique.
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20. Conclusion

21. The interleaving techniques which are based on
the encryption data tools. presents powerful
randomizing engine, furthermore, it enhances the
wireless link security.

22. References
• M. E. Abd Elhameed, M. A. M. El-Bendary, E. O. Begheet, H. M. Abd Elkader, “An Efficient Chaotic Interleaving with
Convolution Encoder and Decoder for Simplicity in LTE System”, International Journal of Networks and
Communications
• Mohsen A.M. El-Bendary , “Developing Security Tools of WSN and WBAN Networks Applications”, Springer Japan
2015
• O Eriksson, “Error Control in Wireless Sensor Networks A Process Control Perspective ”, UPPSALA UNIVERSITY
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23. Thanks for
attention!
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