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  Mobile Phone Calls 
 
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Stephen Bowles Sep 14, 2009, 11:48am EDT Reply - Quote - Report Abuse
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Are calls made on mobiles encrypted? I was reading that calls using Internet telephone are secure because the packets of data send over the Internet are encrypted. Are there ways to prevent mobile calls being intercepted? I once read something about the old analogue mobile phones being vulneable but that security improved with GSM.


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Shawn Langley Sep 14, 2009, 12:49pm EDT Reply - Quote - Report Abuse
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>> Re: Mobile Phone Calls
I have no sources to back it up other than what I've heard but I didn't think mobile calls were encrypted at all..... I'd assumed having the right equipment to decode digital signals at the right TX and RX frequencies you could listen in happily....assuming you knew which channel/freq and the time of your target call.

Same goes for VOIP by default I didn't think they were encrypted anyone could perform a man in the middle attack and intercept the packets and do with as they wish.

Might be worth a 30 second scan over.
http://mobilesociety.typepad.com/mobile_life/2008/04/intercepting-vo.html

As for protecting yourself Id assume there are products out there that do encrypt over the GSM network but at a price....as for VOIP.... you could establish a SSH tunnel or VPN and tunnel the packets over that......

Having voices in your head is normal. Listening to them, common. Arguing, acceptable. However, when you lose the argument, you're in trouble.
Plug & Play Sep 14, 2009, 03:04pm EDT Reply - Quote - Report Abuse
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>> Re: Mobile Phone Calls

What ever you doing or planing mate....YOU FOOKED!

i5 2500K @ 4.8Ghz- Corsiar H50 WaterCooler- Coolermaster Realpower 1000w- Asus P8P67 Deluxe - Asus 6990 4GB - 8GB Corsair DDR3 2000Mhz - X-Fi Sound - 7.1 Surround Speakers - BenQ 24" TFT - G9x Mouse- G19 Keyboard
Stephen Bowles Sep 15, 2009, 10:43am EDT Reply - Quote - Report Abuse
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>> Re: Mobile Phone Calls
Thanks for the link to the website. I shall have a look.

Since writing my message I have read an article about the police in Germany not being able to intercept Skype calls because the data packets are encrypted. They are apparently looking at ways of getting at interception before the voice is converted into a data packet.

I know that the old analogue mobile phones were insecure. Frequencies were shared (as they have to be in mobile technology) and radio transmission was similar to FM radio. Others could sometimes be on the same frequency and listen in. I believe a few Members of Parliament in the U.K. got were the victims of eavesdroppers.

Stephen Bowles Sep 15, 2009, 10:51am EDT Reply - Quote - Report Abuse
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>> Re: Mobile Phone Calls
Not planning anything sinister. I have to reseach mobile phone technology for a course I am doing.


If you lived in the U.K. you would need to be worried about snooping. The government, local authorites and all manner of agencies are at it. Soon Gordon Brown will want people to have cameras shoved up parts of their anatomy that may make sitting down impossible to monitor if they are eating the right food.

I use mail server in Dublin and encrypted connection. Won't stop determined government agency form snooping but would make it more difficult.


Shawn Langley Sep 15, 2009, 11:06am EDT Reply - Quote - Report Abuse
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>> Re: Mobile Phone Calls
Stephen Bowles said:
Soon Gordon Brown will want people to have cameras shoved up parts of their anatomy that may make sitting down impossible to monitor if they are eating the right food.


Lol I have to say that tickled me...absolutely brilliant if you could use it in your course work....

Having voices in your head is normal. Listening to them, common. Arguing, acceptable. However, when you lose the argument, you're in trouble.
Shawn Langley Sep 15, 2009, 11:10am EDT Reply - Quote - Report Abuse
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Edited: Sep 15, 2009, 11:14am EDT

 
>> Re: Mobile Phone Calls
http://hackaday.com/2007/08/11/cccamp-2007-gsm-a5-cracking/
http://hackaday.com/2008/02/15/shmoocon-2008-intercepting-gsm-traffic/

My old friend hack a day....great website if you look at the other sections also but.....

It appears I was wrong and that GSM traffic is encrypted between the mobile and the tower might be worth a look into.

EDIT: Also this link in the comments section has a PDF you might want to borrow some info from
http://www.cs.technion.ac.il/users/wwwb/cgi-bin/tr-info.cgi?20...CS-2006-07

Having voices in your head is normal. Listening to them, common. Arguing, acceptable. However, when you lose the argument, you're in trouble.

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