Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04M—TELEPHONIC COMMUNICATION
  • H04M3/00—Automatic or semi-automatic exchanges
  • H04M3/38—Graded-service arrangements, i.e. some subscribers prevented from establishing certain connections
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04M—TELEPHONIC COMMUNICATION
  • H04M1/00—Substation equipment, e.g. for use by subscribers
  • H04M1/66—Substation equipment, e.g. for use by subscribers with means for preventing unauthorised or fraudulent calling
  • H04M1/667—Preventing unauthorised calls from a telephone set
  • H04M1/67—Preventing unauthorised calls from a telephone set by electronic means
  • H04M1/675—Preventing unauthorised calls from a telephone set by electronic means the user being required to insert a coded card, e.g. a smart card carrying an integrated circuit chip
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04M—TELEPHONIC COMMUNICATION
  • H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04M—TELEPHONIC COMMUNICATION
  • H04M3/00—Automatic or semi-automatic exchanges
  • H04M3/38—Graded-service arrangements, i.e. some subscribers prevented from establishing certain connections
  • H04M3/382—Graded-service arrangements, i.e. some subscribers prevented from establishing certain connections using authorisation codes or passwords

Definitions

• the invention relates to a method for a secure interface between a telephone with a card with subscriber identity and the network when dialing certain, pre-programmed telephone numbers in a telephone system. This is intended to only allow the user of a telephone to dial certain, pre-programmed telephone numbers.
• this feature is designated with FDN (Fixed Dialing Number).
• FDN Fixed Dialing Number
• Chip card the allowed numbers and the fact whether the restriction is switched on or off are stored. If the "Restriction" feature is activated, the phone checks if a number is entered to see whether it is released and, if the result is positive, establishes a connection.
• the interface between card and telephone is freely accessible, so it is very easy to pretend the presence of any number in the list of permitted numbers, e.g. the relevant commands are intercepted.
• the invention has for its object to provide a simple procedure for a secure interface between a telephone with a card and the network for dialing only preprogrammed telephone numbers.
• This object is achieved according to the invention in such a way that when an access or connection request is made, the telephone number is transmitted from the telephone to the card, which checks for a possible release of the number and, if the result is positive, with a secret algorithm from this number and a changing code specified by the network generates a signature and that the signature is transmitted together with the number to the network and by checking the signature the release 5 of the selected number is determined by the card.
• FIG. 1 shows in a flowchart the process sequence for securing telephone numbers authorized by preprogramming.
• Setup is carried out by the mobile device ME (Mobile Equipment) with the telephone number to the network, from which 0 the telephone number is passed on to the authentication center Aut.
• a random number edge is drawn in this, from which a result Res is calculated together with the telephone number.
• Rand and Res (Aut) are transmitted to the network and from this the random number Rand is passed on to the mobile device 5. From here, the edge is transferred and the telephone number to the SIM card (Subscriber Identity Module). The card only calculates a Res result if the phone number is available in the FDN area.
• SIM card Subscriber Identity Module
• the result Res is passed on to the mobile device ME and from there to the network, where a comparison is made with the result from the authentication center Res (Aut).
• the algorithm calculates from the random number Rand and the telephone number and possibly. the result Res, also called response or signature, from an additional card-dependent code. Algorithm and code are only known to the card and the authentication center.
• FIG. 3 shows an embodiment in which a key known from both sides, ie the card and the authentication center, for example Kc from a previous authentication, is used instead of a random number Rand.
• a setup is carried out from the mobile device ME with the telephone number to the network, from which the key and the telephone number are transmitted to the authentication center, and on the other hand the key and telephone number are transmitted to the SIM card.
• the authentication center In the authentication center a result res calculated, also in the map a result Res if the phone number is contained in the FDN memory. Both results, namely Res ( Aut ) and Res (MS) are then compared with one another in the network.

Landscapes

• Engineering & Computer Science (AREA)
• Signal Processing (AREA)
• Computer Security & Cryptography (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Computer Networks & Wireless Communication (AREA)
• Telephonic Communication Services (AREA)
• Meter Arrangements (AREA)
• Facsimile Transmission Control (AREA)
• Data Exchanges In Wide-Area Networks (AREA)
• Financial Or Insurance-Related Operations Such As Payment And Settlement (AREA)
• Mobile Radio Communication Systems (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (2)

Family

ID=7772798

Family Applications (1)

Country Status (8)

Cited By (1)

Families Citing this family (10)

Family Cites Families (19)

• 1996
  • 1996-09-03 US US09/043,396 patent/US6047070A/en not_active Expired - Lifetime
  • 1996-09-03 AU AU72785/96A patent/AU708071B2/en not_active Ceased
  • 1996-09-03 WO PCT/DE1996/001634 patent/WO1997011548A2/de active IP Right Grant
  • 1996-09-03 DE DE59610820T patent/DE59610820D1/de not_active Expired - Lifetime
  • 1996-09-03 EP EP96934408A patent/EP0852092B1/de not_active Expired - Lifetime
  • 1996-09-03 CN CN96198380A patent/CN1110936C/zh not_active Expired - Fee Related
  • 1996-09-09 IN IN1593CA1996 patent/IN190533B/en unknown
  • 1996-09-10 TW TW085111032A patent/TW325626B/zh active

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