Wireless Security. Chapter 6 – Wireless Network Security. Investigators have published numerous reports of birds taking turns vocalizing; the bird spoken to gave its full attention to the speaker and never vocalized at the same time, as if the two were holding a conversation
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
Investigators have published numerous reports of birds taking turns vocalizing; the bird spoken to gave its full attention to the speaker and never vocalized at the same time, as if the two were holding a conversation
Researchers and scholars who have studied the data on avian communication carefully write the (a) the communication code of birds such has crows has not been broken by any means; (b) probably all birds have wider vocabularies than anyone realizes; and (c) greater complexity and depth are recognized in avian communication as research progresses.
—The Human Nature of Birds, Theodore Barber
keystreamReview: Symmetric Stream Ciphers
MAC payloadWEP encryption (1)
New IV for each frame
MAC payloadWEP decryption overview
A-BEnd-point authentication w/ nonce
Nonce:number (R) used only once –in-a-lifetime
How:to prove Alice “live”, Bob sends Alice nonce, R. Alice
must return R, encrypted with shared secret key
“I am Alice”
Alice is live, and only Alice knows key to encrypt nonce, so it must be Alice!
nonce (128 bytes)
nonce encrypted shared key
success if decrypted value equals nonceWEP Authentication
Not all APs do it, even if WEP
is being used. AP indicates
if authentication is necessary
in beacon frame. Done before association.
STA, AP use PMK to derive
Temporal Key (TK) used for message
encryption, integrity802.11i: four phases of operation
AP: access point
STA and AS mutually authenticate, together
generate Master Key (MK). AP servers as “pass through”
sends to AP
EAP over LAN (EAPoL)