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A History of WEP

A History of WEP. The Ups and Downs of Wireless Security. Wireless Communication Beginnings. Early Cordless Phones and Cell Phones Used same idea as Walkie-Talkies Anyone with a “Scanner” could easily eavesdrop on calls Used a Spread-Spectrum algorithm to defeat the traditional “Scanner”.

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A History of WEP

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  1. A History of WEP The Ups and Downs of Wireless Security

  2. Wireless Communication Beginnings • Early Cordless Phones and Cell Phones • Used same idea as Walkie-Talkies • Anyone with a “Scanner” could easily eavesdrop on calls • Used a Spread-Spectrum algorithm to defeat the traditional “Scanner”

  3. The 802.11 Standard • Defines wireless communications protocols • 802.11b, 802.11g, 802.11n common wireless network protocols • Similar to early Cell Phones and Cordless Phones at the start – no real protection • Can easily find out network names and connect to them • Invent of War Driving!

  4. Early Security Attempts • Open Access to Networks – Solution? • Filter the “unique” MAC address of the wireless cards • Problem? • Keep a large list of EVERY network card that can have access • No real authentication or check takes place • MAC addresses can be “spoofed”

  5. Introducing WEP • W.E.P. – Wired Equivalent Privacy • Introduced in September of 1999 • First real attempt at securing open wireless networks • Attempted to make the network as confidential as a traditional wired network • Originally used a 40-bit security key, later expanded to 104-bits, and 232-bits

  6. A Look At WEP • IV – Initialization Vector (24-bits) • Key Selected by User • Combined to create a seed to generate the keystream

  7. All Secured Sir……. • RC4 is a popular cipher used in many security applications • Problem: RC4 is a stream cipher • Keystream cannot be reused or you can get back the message • 24-bit IV has a 50% chance of repeating on a busy network after 5000 IVs generated • Can also capture packets an replay them: poor authentication

  8. Demonstration Time

  9. After WEP • WPA created to use existing hardware • Fixes many of the downfalls of WEP • Not without its own problems • Uses a password to generate keys • Dictionary attack • TKIP Algorithm used has flaws • WPA2 developed to fix WPA • Made before WPA flaw discovered

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