Hello,
i have a question about the functionality of the Osmoscon SimTrace hardware system. Can I log everything, also packets like silent SMS (https://en.wikipedia.org/wiki/SMS#Silent_SMS)?
Thank you for your request.
Flo
Hi Florian,
purely from my personal knowledge and experience (I'm not saying this is a way it works in general), but phone may drop the SMS before it reaches the SIM, if it's corrupted in a way or strictly addresses a phone rather than a SIM card, so.. you may see some of them, you may miss some of them, this really depends .. it's a case-by-case problem.
Cheers, Lukas
2012/3/6 Florian Borggräfe mailman@riseup.net
Hello,
i have a question about the functionality of the Osmoscon SimTrace hardware system. Can I log everything, also packets like silent SMS (https://en.wikipedia.org/wiki/SMS#Silent_SMS)?
Thank you for your request.
Flo
On Tue, Mar 06, 2012 at 09:06:22PM +0100, Florian Borggräfe wrote:
i have a question about the functionality of the Osmoscon SimTrace hardware system. Can I log everything, also packets like silent SMS (https://en.wikipedia.org/wiki/SMS#Silent_SMS)?
I can only follow up to what Lukas wrote. We can trace anything that ever hits the ME - SIM interface. But which phones might or might not forward silent messages to the SIM remains an open question.
My personal educated guess would be that it is probably not sent to the sim in the majority of the cases/phones. SMS on the SIM is an ancient relic, and then in the case of silent SMS, if the phone knows it shall discard it, why first push it to the SIM...
Regards, Harald
one more thing that crossed my mind - it really depends on what you call a "silent sms", it may also be SMS sent to update some parameters of a SIM card (like (F)PLMN list), that is still a silent sms - most phones will not show anything about this being received .. and that will reach the SIM obviously.
however i have no knowledge what authorities/hackers actually use as a silent SMS.
2012/3/6 Harald Welte laforge@gnumonks.org
On Tue, Mar 06, 2012 at 09:06:22PM +0100, Florian Borggräfe wrote:
i have a question about the functionality of the Osmoscon SimTrace hardware system. Can I log everything, also packets like silent SMS (https://en.wikipedia.org/wiki/SMS#Silent_SMS)?
I can only follow up to what Lukas wrote. We can trace anything that ever hits the ME - SIM interface. But which phones might or might not forward silent messages to the SIM remains an open question.
My personal educated guess would be that it is probably not sent to the sim in the majority of the cases/phones. SMS on the SIM is an ancient relic, and then in the case of silent SMS, if the phone knows it shall discard it, why first push it to the SIM...
Regards, Harald
--
- Harald Welte laforge@gnumonks.org
============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)
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Florian Borggräfe -
Harald Welte -
Lukas Kuzmiak