Applications and the Future - Codes: The Guide to Secrecy from Ancient to Modern Times - page 352

Comparisons

Table 9.1

WEP TKIP RSN

Cipher RC4 RC4 AES

Key Size 40 or 104 bits encrypt: 128 128 bits

authenticate: 64

Packet Key Concatenation Mixing function Not Required

Integrity CRC − 32 Michael CCM

Replay None Use IV Use IV

Protection
Key None EAP-based EAP-based

Management

802.11 — Summary

Table 9.2
IEEE WLAN Applications
802.11 - The legacy standard
- Provides 1-2 Mbps transmission in 2.4 GHz band, typically
usingDSSS (see page 341).
802.11a - Extends 802.11 providingup to 54 Mbps in 5-GHz band
- Uses Orthogonal Frequency Division Multiplexing , (OFDM),
which is a means of sendinglarge quantities of data by radio wave.
OFDM operates by separatingthe signals into smaller ones,
sent simultaneously at differingfrequencies.
- 802.11a is, however, not interoperable with the following
802.11b - Provides 11 Mbps in the 2.4-GHz band usingDSSS
- Was ratified in 1999 as the 802.11 standard
- Provides functionality comparable to Ethernet
802.11g - Supplies 20 Mbps in the 24-GHz band, and
up to 54 Mbps when operatingwith 802.11b hardware
802.11i - The TGi has ratified the standard, upgrading Wi-Fi's short-term
solution, WPA, to the security flaws in 802.11a-802.11b
802.11n - To increase throughput to at least 100 Mbps in the 5-GHz range
- Unlike the above, focuses on throughput at the MAC interface,
not the physical layer, so throughput will be the highest possible