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Is there end-to-end voice encryption in GSM ? If not, is voice communication between mobile handset and mobile base station, at least encrypted ? What keys are used there and which alogrithms ? any idea?
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SRTP denotes a technical process for the encrypted transfer of multimedia data (for example speech) via existing networks. SRTP is used for example in internet telephony (Voice over IP, in short: VoIP), in order to guarantee an eavesdrop-secure transfer of telephone data between multiple conversation participants.
In GSM, data stream between mobile subscriber (MS) and BTS is encrypted by A5 encryption algorithm. A5's encryption and decryption key (k c ) is generated base on MS's SIM card parameter (k i ) and a random number, RAND.
GSM stands for either "group special mobile" or "general system for mobile communications," a protocol or standard for digital cellular communications. GSM encryption is the means by which phone conversations on networks using GSM are scrambled, such that they cannot be descrambled and intercepted by others.
GSM communication uses IMSI rarely, it uses TMSI (Temporary Mobile Subscriber Identity) to provide more secure communication and to avoid disclosing of user's identity. This means someone intercepting communications should not be able to learn if a particular mobile user is in the area.
Is there end-to-end voice encryption in GSM ?
No.
If not, is voice communication between mobile handset and mobile base station, at least encrypted ?Yes. Read this.
What keys are used there and which alogrithms ?
A3, A5 and A8 (mostly COMP128).
For more references, read this and this.
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