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Thread: WiFi Security

  1. #1
    Registered User
    Join Date
    Jul 2006
    Location
    Irving, Texas
    Posts
    23

    WiFi Security

    Hi All,
    Presently I am working on WiFi security domain. I have a specific question about EAP-TTLS.
    As all of you are aware that TLS handshake will do three specific task:

    1. It authentuicates the server
    2. It creates a pre master shared key..
    3. And last but not the least it makes a ciphersuite ready.

    Now as we are aware that WPA/RSN has got its own ciphersuite, namely TKIP and AES-CCMP. Hence WPA/RSN version of EAP-TTLS will avoid the last of the above three points.

    Now as we know in EAP-TTLS, after the TLS handshake we tunnel further authentication information. That means that it will go through an encryption layer.

    Assuming we are passing a CHAP response message containg the user name and the password through the tunnel, which of the encryption methodology will take place. what I want to know that will this be encrypted through the TLS record protocol or will it be encrypted by the standard AES-CCMP/RC4-TKIP?

    If somebody can clarify it to me, I will be thankful.

    Thanks in advance..

    Somenath
    Somenath Mukhopadhyay

    "To Win is no more than this:
    To rise each time you fall"

  2. #2
    Registered User
    Join Date
    Jul 2007
    Posts
    6

    Re: WiFi Security

    The delivery of MSK (that has been derived via EAP-methods) is done outside the basic 802.11 framework so it is being encrypted/calculated by any means that EAP-protocol type provides so it encrypted by TLS record protocol. Calculating the PSK from MSK is then done in .11 chipher suite specific protocols such as AES or TKIP.

    Sven

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