Text 30294, 93 rader
Skriven 2009-03-26 12:50:57 av Michiel van der Vlist (2:280/5555)
     Kommentar till en text av Robert Bashe (2:2448/44)
Ärende: Reactions
=================
Hello Robert,

On Tuesday March 24 2009 19:51, you wrote to me:

 RB>>> It has to be one OR the nother, not both.

 MV>> Both. It is transmitted in the handshake, but it is not needed to
 MV>> make the call.

 RB> So how do you make a call without the handshake? I still don't know
 RB> what you're trying to say.

I don't understand why this is so hard for you to understand. It is like a fprm
where some fields are mandatory and some are optional, you can just leave them
blank. if you want to ordr something from a mail order company, you have to
submit an order form. Naturally you need to supply and address, or else they do
not know where to send it to. Bt things like date of birth and gender are
usually optional. They are not required to complete the deal, you can just
leave them blank.

Same for the IMEI. Of course one needs the handshake to initiate the call. But
the IMEI is an optional field, the information it contains it not needed to
make the call.

Contrary to the SNN, without that informationm the call can not be made.


 RB>>> With the proper interface

 MV>> Nothing special, just a standard data cable.

 RB> ;-))) Who told you that one? Sorry, I know better.

As I said, I saw it demonstated. Not on television, in real life. Standard data
cable.

 MV>> Simple is in the eye of the beholder. Once you know how to do it,
 MV>> it is simple.

 RB> Interestingly enough, I've found that's not the case.

Then you had the bad luck of having a phone weher it is not as easy as the onde
I saw in the demonstration.

 RB> I became intrigued with the idea of removing supervisor passwords on
 RB> Thinkpads (IBM laptops) because so many people forget them, buy used
 RB> laptops from companies with the supervisor passwort set and then
 RB> forgotten and the like.

That is a different kettle of fish from changing the IMEI of a cell phone.
Makes me wonder WHY you wanted to change the IMEI of your phone....

 RB> There are people, incidently, who consider a supervisor password (SP)
 RB> "theft protection", but that's just plain wrong, as you can use a
 RB> Thinkpad with a SP set without any problems as long as you never have
 RB> to change the boot order or reset the date/time (as when the CMOS
 RB> battery has to be replaced). Otherwise you don't even notice it's
 RB> there - it's NOT required to boot the machine. (If you want to protect
 RB> your data, you have to set a hard disk password, which is nearly
 RB> impossible to remove - but you can throw the HD _and_ your data away
 RB> if _you_ ever forget the password.)

I never set passwords on the entire machine. I perceive it as just making
things difficult for myself. If any data needs to be protected, I encrypt just
the filke in question. That way, I only lose that file when I lose the
password.

 RB> At any rate, there's a website that deals with this subject, and even
 RB> free software to read out the passwords. But you have to build a
 RB> simple electronic circuit (interface) to attach to the COM port of
 RB> another (host) computer to use it, and have clips to attach to two
 RB> legs of a very small SMD chip (4x4 mm, 4 legs per side). I can do
 RB> this, but if you read the questions at the website, you see that a lot
 RB> of people can't even figure out how to build the interface.

Now is that for the thinkpad, or for the cell phone?

 RB> Knowing how in theory is nice, but without a bit of practice and
 RB> experience, a lot of people can't duplicate what others can.

Very true. I already found that out 40 years ago. I could not make electronic
stuff to work until I *understood* what I was doing. One would think that if
one copies exactly what someone else has made, that it should work. In theory
it does, but in practise it very seldom does. It is too easy to make a simple
error. Reverse a diode or swap two resistores and it will not work. When you
*understand* how it works, you can find the error, if not, it is next to
hopeless.


Cheers, Michiel

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