Wireless Security
本来是第四周的内容，但是考虑到实验部分是无线，所以老师决定把第四周的内容放第三周讲了。
Wireless
- IEEE 802.11 invented in 1997: 1-2 Mbps
- 802.11a: 54 Mpbs with 10 non-overlapping channels
- 802.11b: 11 Mbps with 3 non-overlapping channels
- 802.11g(2003): best of both A&B: 54 Mpbs and 2.4GHz
NOTE!
哪些支持802.11b的设备可以升级固件支持802.11g，但是a就不行，而且a的穿墙能力比较差。
Encryption algorithm
WEP use RC4, WPA use RC4, WPA2 use AES
Compare to wired network
Wireless Network Threats
- Accidental association
- Malicious association
- Ad hoc networks
- Nontraditional networks
- Identity theft (MAC spoofing)
- Man-in-the-middle attacks
- Denial of service (DoS)
- Network injection
The principal threats to wireless transmission are eavesdropping, altering, inserting messages, and disruption.
So, we should use encryption, antivur software, firewall, turn off identifier broadcasting, change default settings. ACL
Major Security Threats for mobile devices
后面很多底层协议的东西
实验部分更加有趣
回家做实验再补充
