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Q: A Mathematical Model for a Recursive identity tracer. ( No Answer,   3 Comments )
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 Subject: A Mathematical Model for a Recursive identity tracer. Category: Science > Math Asked by: mahamannu-ga List Price: \$10.00 Posted: 21 Jul 2006 16:50 PDT Expires: 20 Aug 2006 16:50 PDT Question ID: 748413
 ```Lets say I'm Sam and I have 10 friends. Tomorrow I change my name to Mark with a new phone number, however I still have those 10 friends that I call. Lets say that , that is enough to conclude that Mark's identity can be traced to Sam, by going through his call records, which are similar to what Sam used to have. Now if one or more of those 10 friends may also change identity, with the property that he still calls the same people ,holding true, is it possible for us to trace Mark's identity back to Sam. This is just an example. What is the approximate mathematical model to capture this general problem. I dont need extreme precision, i.e. I know if all 11 friends call only each other and they all change their identity, ie their cell phone number, its impossible to get the trace.```
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 Subject: Re: A Mathematical Model for a Recursive identity tracer. From: xaviergisz-ga on 23 Jul 2006 00:02 PDT
 ```What a strange question. Could you give some context to help someone answer this (and persuade us this is not to be used for a nefarious purposes eg a terrorist cell)```
 Subject: Re: A Mathematical Model for a Recursive identity tracer. From: mahamannu-ga on 23 Jul 2006 16:45 PDT
 ```Well, this is anti-terrorism idea, so nothing nefarious about it. If Sam is a member of a terrorist cell , you want this model to be implemented by cell phone service providerr. Thats so much for the context, which started out purely as a discussion at a coffee table. Let me know if more information is required about it.```
 Subject: Re: A Mathematical Model for a Recursive identity tracer. From: mathisfun-ga on 23 Jul 2006 18:48 PDT
 ```If each friend has the same situation of Sam where they have a defined amount of friends who they call / get calls from with no addition or subtraction to that list of friends then the trace would be fairly easy, if one of Sams friends had a friend list of Person a Person b Person c Sam Person d Person e before Sam became Mark and Person a Person b Person c Mark Person d Person e after, then clearly Sam is Mark, however if another person on that list changed info then you would need to look at another of Sam's old friends call logs and try to get 2 equations with 2 unknowns, at least that is my first guess at the problem.```