Project 2'A Extending NS2 to support encryptiondecryption

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Project 2.AExtending NS-2 to support
encryption/decryption

• Date 04/07/2005
• Course CSCI 5931
• Name Sam Tran
• Tuan Nguyen

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Extending NS-2 to support encryption/decryption

• Abstract
• Approach
• How to add new security features in NS-2
• General design encryption/decryption in NS-2
• Implementation
• Simple demonstration
• Conclusion
• References

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1. Abstract

• Implementation of security on NS-2 is necessary
  in network simulation. However, currently, NS-2
  does not support these features. Our project will
  aim to solve this issue.

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2. Approach

• NS-2 is open source network simulation
  application.
• NS-2 currently supports IP protocol suite and
  various standard routing protocols for wire and
  wireless network.
• To add security functions. We have to
  modify/build new packet formats.

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3. Add new security features in NS-2

• Define a new packet format.
• Derive new class from Agent class for processing
  this new packet format.
• Processing includes
• Encrypting function.
• Decrypting function.
• Message digest generation function.
• E.t.c

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4. General design flow for security packet in NS-2
Figure1 Steps to add new packet to NS-2 and
testing results
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5. Implementation
Figure 2 Logical design of the
encryption/decryption system
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5. Implementation (cont.)

• Hash function
• Polynomial Algorithm.
• Encryption function
• Input String of plain text
• Algorithm CESAR cipher with pre-shared key of 3
• Output Encrypted text.
• Decryption function
• Input string of encrypted text
• Algorithm CESAR cipher with pre-shared key of 3
• Output decrypted text.

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6. Simple demonstration
Figure 3 Outcome of simple demonstration script.
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7. Conclusion

• The project shows a method to add security
  functions into NS-2.
• With this approach, we can build standard
  security components into NS-2 using industrial
  standard algorithm such as SHA-1, MD5 for hash
  function and DES,3DES and AES for
  encryption/decryption.
• Project can be extended to support asymmetric key
  encryption/decryption.

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8. References

• Marc Greis (2005). Tutorial for the network
  simulator ns. Retrieved 3/28/05 from
  http//www.isi.edu/nsnam/ns/tutorial/index.html
• Free Information Society (2005). Hash Table
  Class. Retrieved 4/4/05 from http//www.freeinfos
  ociety.com/computers/programs/cpp/hashtable.h
• Jess Garms, Daniel Somerfield (2001).
  Professional Java Security. ISBN 1-861004-25-7
• Hash function implemented in C with polynomial
  algorithm. Retrieved 4/14/05 from
  http//wikisource.org/wiki/Polynomial_hash_functio
  n