View Full Version : Tapping GSM Conversation
sujithsidhardhan
11-10-2006, 05:39
please let me know whether it is possible or not. If not Why? Just like using a paralell phone or instrument with landline phones..
I think I misunderstood your post before,
you mean "taping" a GSM conversation? Not to difficult to do (I think). You can try one of the following procedures:
1) Use the phone-record function available in most phones
2) Use a Desktop Computer with "Bluetooth Headset gateway" and record conversation on HDD
3) Use a "modded" handsfree and a regular tape recorder
Regards
Ch@in
sujithsidhardhan
11-10-2006, 17:46
Is there any other way to record the conversation without the help of these.. I mean can the operator hear our conversation or record our conversation if he really needs it...
gsm-decode
11-10-2006, 17:56
yeah,Right!
What a Topic!
please let me know whether it is possible or not. If not Why? Just like using a paralell phone or instrument with landline phones..
gsm interception on A5/2 encryption algorithm networks is not possible .
sujithsidhardhan
11-11-2006, 05:15
gsm interception on A5/2 encryption algorithm networks is not possible .
what is the A5/2 encryption algorithm ???
Yes its possible through the "lawful interception" feature at the network stations.
Proof of concept? Here is a link about the scandal of Vodafone Greece where "somebody" enabled this function and was listening into conversations from major greek politicians. http://yorkshire-ranter.blogspot.com/2006/02/id-cards-and-vodafone-scandal.html
sujithsidhardhan
11-11-2006, 16:06
Is there any news rather than this????
Is there any news rather than this????
GSM voice calls are encrypted using a family of algorithms collectively
called A5.With A5/0 is no encryption. A5/1 is the "standard" encryption
algorithm used ny most GSM NETWORKS while A5/2 is the "export" (weakened) algorithm. A5/3 is a new
algorithm based on the UMTS/WCDMA algorithm called Kasumi. All of these algorithms use a 64-bit key derived from a common mechanism:
the mobile receives a random challenge, then the SIM card calculates an authentication
signature and an encryption key. The key calculated does *not* depend on
what algorithm it is destined to be used with.
The encryption is done using a stream cipher, that is, the encryption
algorithm takes the secret key and a frame number, and generates a
pseudo-random stream of bits (keystream) that are XORed with the input to
encrypt it, or are XORed with the received bits to decrypt them.
daniel_dennie
05-29-2007, 07:33
2) Use a Desktop Computer with "Bluetooth Headset gateway" and record conversation on HDD
...
What's the example of Bluetooth Headset Gateway software??
Where i can get it? Is that a freeware?
Thanx B4!
anyone interested in gsm interception should check out the following article
Instant Ciphertext-Only Cryptanalysis of GSM Encrypted Communication (http://www.cs.technion.ac.il/users/wwwb/cgi-bin/tr-info.cgi?2006/CS/CS-2006-07)
there is also the GSM Scanner Project (http://wiki.thc.org/gsm) which started earlier this year..