Block Cipher Modes of Operation and Stream Ciphers. CSE 651: Introduction to Network Security. Abstract. We will discuss How to use block ciphers? RC4: a widely used stream cipher Problems with WEP’s use of RC4. Modes of Operations. How to use a block cipher?.
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CSE 651: Introduction to Network Security
Ci = EK(Pi)
T1 = IV (random)
Ti = IV + i - 1
Ci = Pi ♁ EK(Ti)
C = (IV, C1, C2, C3, ...)
RC4 key: IV (24) Long-term key (40 or 104 bits)
Header IV Packet ICV FCS