AUTHENTICATION OF PERSONS IN A COMMUNICATION SYSTEM

Abstract: An arrangement and a procedure for mutual authentication of persons, at which a first person (A) communicates by a communication device (1) over a communication system (4) with a second person (B) via his/her communication device (2). A request for authentication is transmitted by one of the communicating parties (A, B) to an authentication server (3), which generates two random number codes (X, Y). Both random number codes (X, Y) are transmitted both to the first person (A) and to the second person (B). The authentication is executed by the first person (A) reading aloud one of the random number codes (X) to the second person (B), and the second person (B) reading aloud the other random number code Y to the first person (A), whereupon the communicating persons (A, B) authenticate each other by comparing the code each has had read to his/her with corresponding transmitted code.

Description: AUTHENTICATION OF PERSONS IN A COMMUNICATION SYSTEM Technical field The present invention relates to a procedure and an arrangement for mutual authentication between two persons who communicate over a communication system, more exactly for authentication between persons who communicate with each other over a mobile telephone system. Background In many situations it would be of great value to have possibility to check the identity of the person with whom one is communicating. Examples of occasions when authentication person to person would be advantageous is at payment transactions, when a person shall be admitted trough a gateway, or when a confidential talk is to begin with an unknown opposite party. One problem with authentication of a person in a mobile telephone system is that the technology which is used must be independent of where the in the call included persons are. Another problem is to effect authentication person to person without advanced additions to the mobile telephones of the parties being needed, such as SIMAT, WAP or that the mobile telephones are connected to PDAs. Summary of the invention In order to overcome above mentioned problems, the present invention consequently relates to a procedure for authentication of person at communication between a first person and a second person, including the steps that an authentication server generates two codes, that both codes are transmitted both to the first person and to the second person, that the first person reads one of the codes to the second person, and that the second person reads the other code to the first person, whereupon the communicating persons authenticate each other by comparing the code they have heard read with corresponding transmitted code. Said steps are preferably preceded by one of tie persons transmitting a request for authentication together with an identification of the second person to the authentication server. In one embodiment said identification includes information about where the codes shall be transmitted to reach the second person. In another embodiment said identification is used by the authentication server to produce information about where the codes shall be transmitted to reach the second person. Said codes are preferably transmitted to the communication device of respective person. In one embodiment said codes are transmitted in form of a text message, and are shown on a display device at the communication device. In another embodiment, said codes are transmitted m form of a data sequence which represents a coded sound message, which sound message is played rjack in a loudspeaker at the communication device. In one preferred embodiment said persons must, before the codes are transmitted to them, identify themselves to, and be acknowledged by, the authentication server. In one embodiment said persons identify themselves to the authentication server by transmitting a personal code, which preferably is transmitted as a text message. In another embodiment said personal code is pronounced oy the person via his/her communication device, and is detected by a speech recognition device in cooperation with the authentication server. In yet another embodiment the authentication server identifies said persons by a voice recognition device arranged in cooperation with the authentication server. Said communication devices are preferably mobile telephones, at which the codes are transmitted over a mobile telephone system to said mobile telep-ones, by means of which mobile telephones said persons conr-iicate. Further, the present invention relates to an arrangement for authentication of persons at communication between as first person and a second person, at which said persons communicate with each other via respective communication device over a communication system. The arrangement is characterized in an authentication server arranged in the communication system, which Jthentication server includes an input port arranged to from one of said persons receive a request for authentication . The authentication server further includes a coαe generator ir connection to said input port, arranged to ι- reaction to a received request generate two codes, and distribution devices arranged to via said communication system transmit both said codes to both said communication devices. In one embodiment said authentication request includes an identification of the addresses of said communication devices. In another embodiment said authentication request includes an identification of said persons. In this embodiment said authentication server is preferably connected to a storing device, at which storing device identifications of persons are stored together with respective person's belonging communication addresses, and the authentication server further includes means arranged to in reaction to a received authentication request select communication address depending on received identification. Said code generator is preferably a ranαom number generator. In one embodiment said authentication server is arranged to transmit said codes as text messages, at which said communication devices include presentation/display devices arranged to present/show received codes. In another embodiment said authentication server is arranged to transmit said codes as data sequences represented in a coded sound message, at which said communication devices include devices to convert said data sequences to sound, and a loudspeaker arranged to play back the sound message. In one preferred embodiment said authentication server includes code recognition devices, adapted to detect a personal code given and transmitted to the authentication server by a person with his/her communication device, and devices arranged to identify persons on basis of their personal codes, by, by means of the personal code, find a person' s identification on a storing device which is connected to the authentication server. In one embodiment said code recognition devices are arranged to detect personal codes in form of text messages. In another embodiment said code recognition device includes speech recognition device arranged to detect a pronounced personal code. Alternatively, the speech recognition device can be incorporated m the communication device. In one preferred embodiment said authentication server includes voice recognition devices adapted to identify a person on basis of his/her voice. Preferably are said communication devices mobile telephones, at which said communication system is a mobile telephone system. Brief description of the drawings Preferred embodiments of the present invention are described below in detail, with reference to the only figure, where Figure 1 shows an embodiment of the arrangement according to the present invention. Detailed description of preferred embodiments The invention is based on that an unmvolved, trustworthy party C via an authentication server 3 distributes two unique codes X and Y to the two persons A and B, which are, or want to be, set up in a communication connection with each other. The invention preferably relates to authentication between persons who communicate with each other with mobile telephones 1 and 2 over a mobile telephone system 4, but can also be applied to other types of communication, such as ordinary telephony by cable, or communication over data communication network, for instance Internet. According to the invention, person A then reads aloud for instance code X to the opposite party B, whereas B reads the code Y aloud to A. Person A then compares the code Y, which the person B has read aloud, with the code Y which A has received from the authentication server, whereas person B compares the code X the person A has read aloud, with the code X which B has received from the authentication server 3. In this way a mutual authentication person to person is achieved. In Figure 1 is shown an embodiment of the arrangement according to the present invention. The first person A talks in his/her mobile telephone 1 with the second person B, via his/her mobile telephone 2, over a mobile telephone system . To the mobile telephone system 4 an authentication server 3 is connected via an input port, which authentication server 3 belongs to one for the persons A and B independent party C. When a mutual authentication person to person is wanted, one of the persons, for instance A, gets into contact with the authentication server 3 and transmits a request for authentication. This can be made before or after set up of the call with the person B. The authentication server 3 is arranged to marage A- numbers, and consequently knows who has initiated t- * e contact. The authentication server, however, must also knows who the opposite party B is, so the person A encloses this data. In one embodiment this is made by the person A quite simply enclosing the number to the person B s mcoile telephone 2, i.e. the B-number, to the authentication server 3. In another embodiment the person A transmits some form of identification for B to the authentication server 3, for instance name, civic registration number, organization number or the like. In such an embodiment the authentication server 3 is arranged n connection with a database 5, from which the authentication server 3 can derive stored information about the person B s mobile telephone number, by using a transmitted identification as input data. The authentication server 3 includes code generation devices, preferably a random number generator, arranged to m reaction to a received authentication request generate two codes X and Y. Further, the authentication server 3 is equipped with a distribution device, arranged to transmit both the two codes X and Y, both to said A-number and B- number. By the communicating parties A and B receiving the same codes, they then can authenticate each other by each reading aloud a part, X or Y, of the code pair to each other. Thus authentication is achieved person to person without advanced additions to the communication devices, i.e. the mobile telephones 1 and 2, being needed. Preferably are the codes X and Y transferred as simple text messages, for instance SMS, and shown on the display o respective mobile telephone 1 and 2. Also authentication request is preferably a text message. In a simple case the authentication request consists of a B-number which is transmitted to the authentication server 3 by the authentication server 3 being called. As reaction to that call, the authentication server 3 generates two codes X and Y, and transmits them to the A-number from which the authentication request was transmitted, and tre enclosed B- number . In one emboαiment the authentication server is arranged for communication with voice commands, so that authentication request can be pronounced in the microphone of the mobile telephone, and the codes X and Y can be played back in the loudspeaker of the mobile telephone. Either the authentication server 3 or the mobile telephone 1 respective 2 is m this embodiment arrangeα with a speech recognition device, whereas the mobile telephones 1 respective 2 include devices for play back of a received message with a synthetic voice. In one embodiment is to the communicating parties A and B also transmitted information about the parties A and B which is stored m the database 5, i.e. name or the like as above, together with the codes X and Y. In a preferred embodiment of the arrangement according to the invention, the parties A and B are known m advance by the independent party C, and have to identify themselves to the authentication server 3 before the codes X and Y can be distributed. This identification can for instance be made by a personal code for respective A and B being entered on respective person's mobile telephone 1 and 2, and being transmitted to the authentication server 3. The authentication server 3 includes means to detect the transmitted personal code, and means to check its authenticity. Preferably is the authentication server 3 internally or externally connected to a database 5, m which the identification of the communicating parties are stored, for instance in form of a digital certificate, as well as their personal codes. The personal code can be a simple combination of digits in known way, which is transmitted to the authentication server 3 as a text message as above. The code can also be a voice signature, at which the authentication server includes a voice recognition device arranged to detect a spoken voice, and to find the person' s identification and/or mobile telephone number in the database 5 with his/her voice signature as input data. In one embodiment is required that both parties A and B are identified by the authentication server 3 before the codes X and Y are distributed. The invention consequently describes a general form of mutual authentication between persons, preferably mobile telephone subscribers. The invention can for instance be utilized in combination with a pay system, at which the technology offers a way to buyers and sellers to verify the identity of the opposite party. The invention can also be used when one, at a normal call, wants to be sure that the person one is talking with is the right person. Today there exist methods for authentication towards a central server. The invention instead describes a technology for authentication person to person, and which does not make any specific demands upon the terminals 1 and 2. For the realization via a mobile telephone system 4 it is sufficient with an ordinary GSM-telephone with capacity to transmit and receive SMS. The expert, however, realizes that the invention also can be realized m other types of communication systems 4, with to them belonging communication devices 1 and 2. One example is communication over Internet 4 between data communication terminals 1 and 2, for instance PC, at which the equivalence of the A- number and the B-number is the IP-address. Another example is communication between ordinary telephones by wire. The invention is only limited by the enclosed patent claims.

Claims: PATENT CLAIMS 1. Procedure for authentication of persons at communication between a first person (A) and a second person (B) , including the steps that: an authentication server (3) generates two codes (X;Y) ; both codes (X,Y) are transmitted to the first person (A) and to the second person (B) ; - the first person (A) reads aloud one of the codes (X) to the second person (B) , and the second person (B) reads aloud the other code (Y) to the first person (A) ; the communicating persons (A,B) authenticate each other by comparing the code that has been read aloud to them with corresponding transmitted code. 2. Procedure as claimed in patent claim 1, where said step is preceded by one (A) of the persons transmitting a request for authentication to the authentication server (3) . 3. Procedure as claimed in patent claim 2, where one of the persons (A) together with said request for authentication transmits an identification for the second person (B) . 4. Procedure as claimed in patent claim 3, where said identification includes information about to where (2) the codes (X,Y) shall be transmitted to reach the second person (B) . 5. Procedure as claimed in patent claim 3, where said identification is used by the authentication server (3) to produce information about where (2) the codes (X,Y) shall be transmitted to reach the second person. 6. Procedure as claimed in any of the previous patent claims, where said codes (X,Y) are transmitted to respective person's (A,B) communication device (1,2). 7. Procedure as claimed in patent claim 6, where said codes (X,Y) are transmitted n form of a text message, and are presented/shown on a display device at the communication device (1,2) . 8. Procedure as claimed m patent claim 6, where said codes (X,Y) are transmitted in form of a data sequence whicr represents a coded sound message, which sound message is played back in a loudspeaker at the communication device (1,2) . 9. Procedure as claimed n any of the previous patent claims, where said persons (A,B), before the codes (X,Y) are transmitted to them, must identify themselves to the authentication server (3), and be acknowledged by the authentication server (3) . 10. Procedure as claimed in patent claim 9, where said persons (A,B) identify themselves to the authentication server (3) by transmitting a code. 11. Procedure as claimed in patent claim 10, where said code is transmitted as a text message. 12. Procedure as claimed in patent claim 10, where said code (X,Y) is pronounced by the person (A,B) with his/her communication device (1,2) and is detected by a speecr recognition device in cooperation with the authentication server (3) . 13. Procedure as claimed in patent claim 9, where a voice recognition device in cooperation with the authentication server (3) identifies said persons (A,B). 14. Procedure as claimed in any of the previous patent claims, where said communication device (1,2; are mobile telephones, at which the codes are transmitted over a mobile telephone system (4) to said mobile telephones (1,2 by means of which said persons (A,B) communicate. 15. Arrangement for authentication of persons at communication between a first person (A) and a second person (B) , at which said persons communicate with each other via respective communication device (1,2) over a communication system (4), c h a r a c t e r i z e d m an authentication server (3) arranged in the communication system, which authentication server includes an input port arranged to, from one (A) of said persons, receive a request for authentication, a code generator m connection to said input port, arranged to, m reaction to a received request, generate two codes (X,Y), and distribution devices in connection to an output port, arranged to, via said communication system (4), transmit both said codes (X,Y) to both said communication devices (1,2). 16. Arrangement as claimed in patent claim 15, where said request for authentication includes an identification of the addresses of said communication device (1,2) . 17. Arrangement as claimed in patent claim 15, where said request for authentication includes an identification of said persons (A,B) . 18. Arrangement as claimed in patent claim 17, where said authentication server (3) is connected to a storing device (5), at which storing device identifications of persons are stored together with belonging communication addresses of respective persons, and where the authentication server (3 further includes means arranged to, in reaction to a received request for authentication, select communication address from the storing device (5) depending on received identification. 19. Arrangement as claimed m any of the patent claims 15- 18, where said code generator is a random number generator arranged to generate random number codes. 20. Arrangement as claimed m patent claim 19, where said authentication server is arranged to transmit said codes (X,Y) as text messages, and where said communication device (1,2) includes display devices arranged to display receiveα codes (X, Y) . 21. Arrangement as claimed in patent claim 19, where said authentication server is arranged to transmit said codes (X,Y) as data sequences representing a coded sound message, and where said communication device (1,2) includes devices to convert said data sequences to sound, and a loudspeaker arranged to play back the sound message. 22. Arrangement as claimed in any of the patent claims 15- 21, where said authentication server (3) includes code recognition devices, adapted to detect a personal code given and transmitted to the authentication server (3) by a person (A,B) with his/her communication device (1,2), and devices, arranged to, from a storing device (5) connected to the authentication server (3), derive an identification for a person by means of his/her personal code. 23. Arrangement as claimed in patent claim 22, where said code recognition devices are arranged to detect personal codes in form of text message. 24. Arrangement as claimed in patent claim 22, where said code recognition devices include speech recognition devices arranged to detect a pronounced personal code. 25. Arrangement as claimed in patent claim 22, where said communication devices (1,2) include speech recognition devices arranged to detect a pronounced personal code. 26. Arrangement as claimed m any of the patent claims 15- 21, where said authentication server (3) includes voice recognition devices, adapted to identify a person (A,B'ι on basis of his/her voice. 27. Arrangement as claimed in any of the patent claims 15- 26, where said communication devices (1,2) are mobile telephones, at which said presentation/display devices are displays .

Inventors: ANDERSIN MIKAEL, BLOMKVIST HAAKAN, EMILSSON STELLAN, ERIKSSON JONAS, GUSTAFSSON JAN, ANDERSIN, MIKAEL, BLOMKVIST, HAAKAN, EMILSSON, STELLAN, ERIKSSON, JONAS, GUSTAFSSON, JAN
Applicants: TELIA AB
Application year: 2001
Main classification: H04Q7
IPC codes: H04W12