EP0447380B1
Expired / Lapsed
EP
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A method of carrying out an authentication check between a base station and a mobile station in a mobile radio system
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1991-01-29
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Granted: 1995-04-12
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Expires: 2011-01-29
Abstract
Abstract A method for carrying out an authentication check in a mobile telephone system in which an authentic base station (BS) serves a plurality of mobile stations (MS1-MSn). It is earlier known to carry out a unidirectional check from the base station (BS) to a calling mobile station (MSk). A false base station (BSf) is able, in this way, to carry out a false authentication check, by collecting a number of so-called RAND-Response pairs. In order to avoid this, there is introduced a further unidirectional authentication check, base station-mobile station, and also an authentication check from the mobile station to the base station. According to one embodiment of the method, the unidirectional check is excluded and only the bidirectional authentication check is carried out. <IMAGE>
Inventors
- 👤 Wilkinson Paul Dent
- 👤 Alex Krister Raith
- 👤 Jan Erik Ake Steinar Dahlin
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 23:12
CPC Classifications
H; H04; H04W; H04W12/00; H04W12/06; H04W84/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
131 words
A method for carrying out an authentication check between a base station (BS) and a mobile station (MSk) in a mobile radio system, in which prior to establishing a connection, the base station sends a question concerning the authentication of the mobile and orders the mobile to send a first response signal (Resp 1) which is used in the base station to establish the authentication of the mobile, characterized in that subsequent to establishing the authentication of the mobile (2, 3, 4) in the base station, there is sent from the base station a second response signal (Resp 2) to the mobile, which therewith forms (8) a corresponding second response signal (Resp 2) in order to establish (9) the authentication of the base station (BS) prior to the connection being established.
Claim 2
Dependent Claim
46 words
A method according to Claim 1, characterized in that after said authentication of the base station (BS) is established, the mobile sends a third response signal (Resp 3) to the base station which again establishes the authentication of the mobile prior to the connection being established.
Claim 3
Dependent Claim
80 words
A method according to Claim 1, characterized in that said second response signal (Resp 2) is formed from a random number (RAND 2) produced in the base station and from the identification number (PIN) of the mobile, and in that the authentication of the base station is established by comparing (9) said second response signal with a signal produced in the mobile in dependence on the received random number (RAND 2) and the identification number (PIN) available in the mobile.
Claim 4
Dependent Claim
117 words
A method according to Claim 2 or 3, characterized in that said third response signal (Resp 3) sent to the base station is formed from said random number (RAND 2) and from the identification number (PIN) of said mobile, in that said signal is sent to the base station; and in that said base station forms a corresponding signal in a similar manner from said random number (RAND 2) and the identification number (PIN) of the mobile available in said base station; and in that a comparison (12) is made in the base station between the formed signal and the sent signal such that when agreement is found between said signals, a speech connection can be established.
Claim 5
Independent Claim
120 words
A method of carrying out an authentication check between a base station (BS) and a mobile station (MSk) in a mobile radio system subsequent to the mobile station having asked for and being assigned a connection over a given channel, characterized by forming in the base station (BS) a first response signal (Resp 2), sending said first response signal to the mobile (MSk) which therewith forms a corresponding response signal (Resp 2) for the purpose of verifying the authentication of the base station and, subsequent to establishing such authentication, the mobile sends a second response signal (Resp 3) to the base station, which forms a corresponding response signal and establishes the authentication of the mobile prior to establishing a connection.
Claim 6
Dependent Claim
80 words
A method according to Claim 5, characterized in that said first response signal (Resp 2) is formed from a random number (RAND 2) produced in the base station and from the identification number (PIN) of the mobile, and in that the authentication of the base station is established by comparing (9) said first response signal with a signal produced in the mobile and contingent on the received random number (RAND 2) and the identification number (PIN) accessible in the mobile.
Claim 7
Dependent Claim
117 words
A method according to Claim 5, characterized in that said second response signal (Resp 3) sent to the base station is formed from said random number (RAND 2) and from the identification number (PIN) of the mobile, said signal being sent to the base station, and in that the base station forms a corresponding signal in a similar manner from said random number (RAND 2) and from the identification number (PIN) of the mobile available in the base station; and in that a comparison (12) is carried out in the base station between the signal formed by said base station and the signal received by said station and a speech connection is established when these signals coincide.
References Cited (Backward Citations)
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