Login Manager

Eric Johnson eric at ebj.us
Mon Aug 6 05:04:55 CEST 2007

Rod Whitby wrote:
> Shakthi Kannan wrote:
>> On 8/5/07, Giles Jones <giles.jones at zen.co.uk> wrote:
>>> Passwords and pins are pretty fiddly, even tedious to enter.
>> AFAIK, when you buy a SIM card, you are given a 4-digit PIN number,
>> which is the only means of authentication between the end-user and the
>> GSM part of the phone. So, we have to live with that.
> This is not the case.  I personally have a SIM card with *no* PIN on it.
>  I could set a PIN on it if I chose to, but for that card I choose not to.
> Setting the PIN is a choice of the user.  It does not have to be set.
> So any login scheme cannot assume that the SIM card has a PIN on first boot.
Actually, there is always a PIN on the SIM it's just that in your case 
it has been disabled -- this is standard for some operators. To 
re-enable it you need to know the PIN or the PUK.
Nonetheless, your point is correct that one cannot assume the PIN is 
activated on first boot.


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