Re: [Openbts-discuss] When is my voice or SMS traffic encrypted during BTS and MS communication?

[Arthur R. <art...@gm...>]

This is the only thing I have modified (Encrypt 1) : now when I place a
call, it prints Public A5/3 in the CLI, so I believe it works (even though
I have other issues with sound in calls, see my topic with Kostas)

Le Thu Feb 12 2015 at 16:38:06, Ralph A. Schmid, dk5ras <ra...@sc...>
a écrit :

> I am not sure if this is all, I did not yet try it out, just remember it
> included a few steps, and it may be easy to miss one. Point to the binary
> maybe?
>
>
> Ralph.
>
>
>
> *From:* Arthur Rabaté [mailto:art...@gm...]
> *Sent:* Thursday, February 12, 2015 4:33 PM
> *To:* Ralph A. Schmid, dk5ras; Danny Crane; OpenBTS Discuss
> *Subject:* Re: [Openbts-discuss] When is my voice or SMS traffic
> encrypted during BTS and MS communication?
>
>
>
> Hi Ralph,
>
> What do you mean by "read carefully" ?
>
>
>
> When you have registered the imsi with kis through nmcli, don't you just
> have to enable : GSM.Encrypt 1 (or smthing like that) ?
>
>
>
> Kind Regards,
>
>
>
> Arthur
>
>
>
> Le Thu Feb 12 2015 at 10:38:28, Ralph A. Schmid, dk5ras <ra...@sc...>
> a écrit :
>
> Encryption is not mandatory for GSM, but optional. To use it with OpenBTS
> you need a SIM with known secrets, means, you need to program one yourself,
> and you need to read carefully through the documentation how to enable
> encryption. The standard OpenBTS setup works unencrypted for all
> communication situations.
>
>
>
> Ralph.
>
>
>
> *From:* Danny Crane [mailto:tra...@gm...]
> *Sent:* Thursday, February 12, 2015 8:25 AM
> *To:* OpenBTS Discuss
> *Subject:* [Openbts-discuss] When is my voice or SMS traffic encrypted
> during BTS and MS communication?
>
>
>
> Hi,
>
>
>
> I have the OpenBTS set up. Voice and SMS are working perfectly. But I was
> confused about one thing. In GSM, BTS encrypts voice (and SMS?) traffic
> using A5. The key used in A5 is derived from a random number and the shared
> key stored in the sim card and the network database using A8. This shared
> key is looked up in the network database by the IMSI or TMSI value.
>
>
>
> In my set up, I purchase a sim from a commercial carrier. That means my
> OpenBTS does not have a shared key with the sim card. But I can still do
> the following:
>
>
>
> 1. Make echo phone call from MS to OpenBTS
>
> 2. send sms from OpenBTS to MS
>
> 3. send sms to 411 from MS to OpenBTS
>
> 4. send sms between two MS.
>
>
>
> Moreover, I can see my SMS messages in plaintext using wireshark.
>
>
>
> Is there any encryption happening in the four scenarios I mentioned?
>
> If yes, why I can still see the plaintext through wireshark and how can
> the OpenBTS decrypt it.
>
> If no, which protocol specification does it follow?
>
>
>
>
>
> Thanks,
>
>
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