1. Resource Sharing of Portable Computers Using Wireless Communication By Christine Meyer

2. Outline Routing Protocols Load Balancing Techniques Cluster Computing Software Wireless Security Attacks Conclusion

3. Wireless Adhoc Mode Peer-to-Peer Communication

4. Wireless Infrastructure Mode Communication through Access Point

5. Direct Sequence Spread Spectrum (DSSS)

6. Wireless Range

7. Routing Protocols Dynamic Source Routing (DSR) Destination Sequence Distance Vector (DSDV) Temporary-Ordered Routing Algorithm (TORA) Ad Hoc On-Demand Distance Vector (AODV)

8. Comparison of Routing Protocols Packet Delivery RatioRouting Overhead

9. Diffusive Load Balancing on Domain

10. Windows Management Instrumentation Namespace: root\WMI for signal strength root\CIMV2 for LB information

11. Cluster Computing Software Resource Manager Server Job ManagerClient Manager Application Client Display Manager

12. Wireless Network Display

13. Client to Server Routing 1 Server Client A Client B Routing A

14. Client to Server Routing 2 Server Client A Client B Routing A, B Routing to Server

15. Encryption using Java import javax.crypto.*; import javax.crypto.spec.*; import java.security.*; SecretKey key = KeyGenerator.getInstance("DESede").generateKey(); byte[] keyBytes = new byte[] {107,127,4,115,-23,55,93,47, -36,-105, -26, 4, 38, -83,-29, 62, 107,127,4,115,-23,55,93,47}; try { SecretKey key = new SecretKeySpec(keyBytes, "DESede"); Cipher ecipher = Cipher.getInstance("DESede"); ecipher.init(Cipher.ENCRYPT_MODE, key); // Seal (encrypt) the object s1 = new SealedObject(mat1, ecipher); s2 = new SealedObject(mat2, ecipher); } catch (Exception e) {}

16. Decryption with Java byte[] keyBytes = new byte[] {107,127,4,115,-23,55,93,47, -36,-105, -26, 4, 38, -83,-29, 62, 107,127,4,115,-23,55,93,47}; try { SecretKey key = new SecretKeySpec(keyBytes, "DESede"); Cipher dcipher = Cipher.getInstance("DESede"); dcipher.init(Cipher.DECRYPT_MODE, key); // Unseal (decrypt) the class a = (Matrix)s1.getObject(dcipher); b = (Matrix)s2.getObject(dcipher); } catch (Exception e) {}

17. Java Transformation String Algorithm AES, Blowfish, DES, DESede, RSA, RC2, RC4, RC5 Mode None, CBC (Cipher Block Chaining), CFB (Cipher Feedback Mode), ECB (Electronic Codebook), OFB (Output Feedback Mode), PCBC (Propagating Cipher Block Chaining) Padding No Padding, PKCS5Padding SSL3Padding Default: DES/CBC/PKCS5Padding (64 bits to 128 bits) DES 64 bits to 64 bits: transform = "DES/ECB/NoPadding“

18. Passive attacks to decrypt traffic Destination Eavesdropper Packet 1 XOR Packet 2 = Plaintext Access Point

19. Active attack to inject new traffic Destination Eavesdropper RC4(X) XOR X XOR Y = RC4(Y) Access Point

20. Active attacks to decrypt traffic Eavesdropper Access Point InternetEavesdropper’s Computer Encrypted Message Decrypted Message Decrypted Message

21. Table based Attack Destination Eavesdropper Access Point Table of IV and Key Streams

22. WPA Denial of Service Attack WPA can shutdown the system if it receives two failed packets within a one- second period Wi-Fi Encryption Fix Not Perfect http://www.wired.com/news/business/0,13 67,56350,00.html

23. Conclusion It is possible to improve performance through resource sharing of portable computers In the future, the transfer rate for wireless will be greater therefore reducing transfer time Security is provided for access points but not for ad-hoc mode Encryption is possible through Java with a small overhead factor