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- From: htoyryla@ntc01.tele.nokia.fi
- Subject: Re: Crypt. methods used in GSM?
- Message-ID: <1992Dec22.150749.1@ntc01.tele.nokia.fi>
- Lines: 42
- Sender: usenet@noknic.nokia.fi (USENET at noknic)
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- Organization: Nokia Telecommunications.
- References: <ARI.HUTTUNEN.92Dec21003500@cardhu.cs.hut.fi>
- Distribution: sci
- Date: Tue, 22 Dec 1992 13:07:49 GMT
-
- In article <ARI.HUTTUNEN.92Dec21003500@cardhu.cs.hut.fi>, Ari.Huttunen@hut.fi (Ari Huttunen) writes:
- > What encryption algorithm is used in GSM (Groupe Special Mobile)
- > mobile phones? It is my understanding that some single-key
- > encryption algorithm is used, where the phone company supplies
- > both partisipants of the conversation the necessary key.
- >
- > How secure is this algorithm? And how about the phone companies?
- >
- > For those of you who are not familiar with GSM, it is a digital
- > mobile phone system that will cover the whole of Europe. And
- > no, the algorithm is not an XOR-operation, that much I already
- > know. BTW, judging by the discussion here a while ago, we won't
- > be able to sell those phones to the US...;)
- >
- > ................................................................................
- > Ari Huttunen
-
- GSM has encryption algorithms for encrypting of both speech/data
- and of signalling. The encryption is over the air (from user to
- base station) and not between two users. If there is a call between
- two GSM subscribers, the encryption at both ends is independent of
- the other. The actual keys are NEVER transferred over the air.
-
- Some of the algorithms used are specified in the GSM specs.
- Some of them are (or can be) operator specific. This is because
- each subscriber gets an intelligent card from the operator
- which (and not the actual GSM phone) carries the subscriber
- dependent info.
-
- Regards
-
- Hannu
-
- (Don't ask me more, I'm not the expert. This was all that I know.)
-
- --
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