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Phorm and MAC Addresses
Moderators: Jim Murray, narcosis, felixcatuk, Sammy
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felixcatuk
Sun Mar 23 2008, 12:07PM

Registered Member #95
Joined: Wed Mar 05 2008, 12:03AM
Posts: 249
Just a vague theory at this stage, but given analysis on the UID cookies, it seems there's a 6 byte field in the UID... A MAC address is a 6 byte field, and would be very very appealing to Phorm to allow them to track activity from a given end user machine (independant of current IP address).

See recent posts here...

http://www.badphorm.co.uk/e107_plugins/forum/forum_viewtopic.php?1608.30

Anyone got any thoughts? Is that a rubbish idea?

[ Edited Sun Mar 23 2008, 12:08PM ]

ISP customers; you don't need Phorm, pure and simple.
Don't be a passive recipient of Phorm cookies.
Until Phorm can be stopped, use the Dephormation Firefox Add On.
http://www.dephormation.org.uk
The user called PhormUKPRTeam/PhormUKTechTeam is a PR consultant from Citigate Drew Rogerson.
RIPA: ISPs HAVE NO CONSENT FOR INTERCEPTION OF THIS TRANSMISSION ;o)
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TheOtherSteve
Wed Mar 26 2008, 09:52AM
Registered Member #178
Joined: Thu Mar 13 2008, 03:55PM
Posts: 48
Perhaps not a rubbish idea at all, but if it _is_ a MAC (and I agree that would be a handy thing for Phorm to have), would it not be the MAC of the gateway, rather than an individual machine ? In fact, wouldn't the only MAC address the profiler (or whatever it is that generates the cookie) sees be the MAC address of whatever machine it is wired to ? I guess this depends on what protocols and tunnelling are in use. Clues appreciated.

Does the gateway's MAC even get any further than the DSLAM ? Guess it's time to crack open that DSL textbook that I bought remaindered for a fiver and has never come off the shelf!

Speculation aside (for the moment) I've read the other thread, and I agree, that's not random.

I noticed the increment as well, in very limited testing before the weekend, at first I took it be a timestamp, but it wandered off quite quickly.

I have speculated elsewhere that it would be difficult to tell a 'random' cookie from one which is simply an encrypted (or otherwise obfuscated) set of key/value pairs, so with my tinfoil hat on, I think you may be on to an interesting line of enquiry.
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