Advanced Topics in Wireless Networks 600.647

Table of contents

Advanced Topics in Wireless Networks 600.647

Overview

This Lecture …

Additional Reading

Wireless Communication

Access Point Operation

What’s the big deal about security?

Threats – the short story

Threats - details

Methods to provide communication security

SSID

MAC filtering

Wired Equivalent Privacy

Begin Crypto

Security Primitives

Symmetric and Public Cryptography

Encryption algorithms

Diffie-Hellman Key Exchange

Digital Signatures

Certificates and CAs

Hash Chains

End Crypto

WEP – description

Risk of Keystream Reuse

Exploiting Keystream Reuse

Prevent keystream reuse

More observations – IV

24-bit IV Space

Spoofing Packets

Summary

Author: Cristina Nita-Rotaru

E-mail: crisn@cs.jhu.edu

Homepage: www.cs.jhu.edu/~crisn

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