3DES and Block Cipher Modes of Operation. CSE 651: Introduction to Network Security. Abstract. We will discuss 2DES and 3DES AES (Advanced Encryption Standard) How to use block ciphers? RC4: a widely used stream cipher Problems with WEP’s use of RC4. Multiple Encryption with DES.
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CSE 651: Introduction to Network Security
C = EK2(EK1(P))
C = EK1(EK2(EK1(P)))
K1 K2 K1
E D E
Some mathematics used in AES
Ci = EK(Pi)
T1 = IV
Ti = Ti-1 + 1
Ci = Pi XOR EK(Ti)
RC4 key: IV (24) Long-term key (40 or 104 bits)
Header IV Packet ICV FCS
Tews, Weinmann, and Pyshkin wrote an article, “Breaking 104 bit WEP in less than 60 seconds,” discussing how to discover the RC4 key by analyzing the easily identified ARP packets.