SECURITY

1. CBC Mode and Initial Vector for the AES algorithm in WIMAX Protocol Stack JAN 2, 2012 AJALA.AJ [email_address] AJAL.A.J ASST PROF – METS SCHOOL OF ENGG , MALA; KERALA MOB: 0- 8907305642

4. Review of the Block Cipher Plaintext data byte p AJAL.A.J ASST PROF – METS SCHOOL OF ENGG , MALA; KERALA MOB: 0- 8907305642 Pseudo-random number generator “ key stream” byte b  Ciphertext data byte c = p  b

5. Encryption Algorithms AJAL.A.J ASST PROF – METS SCHOOL OF ENGG , MALA; KERALA MOB: 0- 8907305642   3key TDES  2key TDES TDES     256   192    128 AES Top Secret Secret After 2010 Through 2010 Suite B Unclassified use

7. Authentication

8. Data Key Exchange

9. Data Encryption

11. OFDMA System Architecture 2008 Spectrum Frequency User A User B User C Frequency Time User A User B User C 01/02/12 BS User A User B User C

12. WiMAX Security Architecture

16. CBC Mode AJAL.A.J ASST PROF – METS SCHOOL OF ENGG , MALA; KERALA MOB: 0- 8907305642 P1 IV E K C1 P2 E K C2 C1 D K P1 IV C2 D K P2 Pn E K Cn Cn D K Pn ENCRYPT DECRYPT

17. Counter Mode (a stream cipher mode) AJAL.A.J ASST PROF – METS SCHOOL OF ENGG , MALA; KERALA MOB: 0- 8907305642 ENCRYPT DECRYPT C1 E K CTR1 1 P1 P2 E K C2 CTR2 C2 E K P2 CTR2 Pn E K Cn Cn E K Pn CTRn CTRn • • • • • • P1 E K C1 CTR1 Keystream

19. BI-SOVA BLOCK DIAGRAM

21. SYSTOLIC ARRAY

26. TRANCEIVER OF MIMO OFDM

30. Feedback? AJAL.A.J ASST PROF – METS SCHOOL OF ENGG , MALA; KERALA MOB: 0- 8907305642