EP1025739A2 - Generation of a seed number - Google Patents

Generation of a seed number

Info

Publication number
EP1025739A2
EP1025739A2 EP98958929A EP98958929A EP1025739A2 EP 1025739 A2 EP1025739 A2 EP 1025739A2 EP 98958929 A EP98958929 A EP 98958929A EP 98958929 A EP98958929 A EP 98958929A EP 1025739 A2 EP1025739 A2 EP 1025739A2
Authority
EP
European Patent Office
Prior art keywords
encryption
algorithm
key
seed number
seed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98958929A
Other languages
German (de)
French (fr)
Inventor
Pasi Lahtinen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sonera Oy
Original Assignee
Sonera Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sonera Oy filed Critical Sonera Oy
Publication of EP1025739A2 publication Critical patent/EP1025739A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/04—Key management, e.g. using generic bootstrapping architecture [GBA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/03—Protecting confidentiality, e.g. by encryption
    • H04W12/033—Protecting confidentiality, e.g. by encryption of the user plane, e.g. user's traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/06—Network architectures or network communication protocols for network security for supporting key management in a packet data network
    • H04L63/062—Network architectures or network communication protocols for network security for supporting key management in a packet data network for key distribution, e.g. centrally by trusted party

Definitions

  • the present invention relates to a method as defined in the preamble of claim 1 for computing the key to an encryption algorithm used to encrypt messages transmitted over a telecommunication network and for generating the seed number needed for the computation of the encryption key by making use of the subscriber identity module of a mobile station.
  • the invention relates to a system as defined in the preamble of claim 7 for computing the key to an encryption algorithm used to encrypt messages transmitted over a telecommunication network and for generating the seed number needed for the computation of the encryption key by making use of the subscriber identity module of a mobi- le station.
  • SIM cards Subscriber Identity Module
  • the encryption algorithm implementing the encryption needs an encryption key.
  • a method is known in which a separate algorithm for computing the encryption key is implemented in the subscriber identity module of a mobile station.
  • the encryption key is stored on the subscriber identity module in conjunction with manufacture.
  • the encryption key is stored on the subscriber identity module when the latter is taken into use.
  • a problem with the prior-art methods is that managing the seed number needed for the computation of the encryption key and/or managing the encryption key is difficult and, e.g.
  • a further problem is that an encryption key permanently stored on the subscriber identity module is not as secure as an encryption key having a variable value.
  • the object of the present invention is to disclose a new type of method that eliminates the problems described above.
  • a further object of the invention is to disclose a system that can be used to implement said method.
  • a specific object of the present invention is to disclose a method and a system that allow flexible and safe management of seed numbers and encryption keys.
  • the encryption key. required by the encryption algorithm used for the encryption of communication is computed from a certain seed number by making use of the subscriber identity module of the mobile station.
  • the mobile station When the mobile station is activated, its subscriber identity module performs an authentication procedure with the mobile communication network. This is done by using an operator- specific authentication algorithm and a seed number consisting of a random number RAND generated by the mobile communication network.
  • the same authentication algorithm can be used to compute an encryption key.
  • the seed number is a number computed on the basis of a ran- dom number RAND generated by the authentication centre AC of the mobile communication network.
  • an application in the subscriber identity module computes the encryption key and stores it in the subscriber identity module. This encryption key is used when messages are to be encrypted and/or decrypted.
  • the present invention has the advantage that it makes the management of seed numbers and encryption keys considerably easier and simpler than before. As the seed numbers and encryption keys are calculated in the subscriber identity module when necessary, they need not be transmitted or set. A further advantage is that no separate equipment is needed for the management of seed numbers and encryption keys, which means that cost savings are achieved.
  • the invention also increases security. In the met- hod of the invention, the encryption key changes continuously and it is not transmitted anywhere, thus considerably reducing the chance of its getting into the hands of outsiders.
  • a seed number is calculated from a random number RAND generated by the authentication centre, producing a seed number such as RA D+1.
  • the encryption key is computed by using an A3 algorithm, which is an operator-specific authentication algorithm.
  • one or more encryption keys are used.
  • each application requiring encryption has its own encryption key, thus increasing security.
  • the encryption key is computed by using one or more successive algorithms so that the result of the preceding algorithm is used as the seed number for the next algorithm. This provides the advantage that the seed number for the new algorithm is changed, which leads to increased security.
  • a certain portion of the random number range used by the mobile communication network is reserved for the calculation of seed numbers.
  • the system of the invention for computing the key to an encryption algorithm used to encrypt messages transmitted over a telecommunication network and for generating the seed number needed for the computation of the encryption key by making use of the subscriber identity module of a mobile station comprises an encryption device and means for the transmission of encrypted messages.
  • the encryption device comprises a me- ans for computing an encryption key from a seed number.
  • the means used to transmit encrypted messages comprise a mobile station and an encryption server.
  • an encryption device is implemented both in the subscriber identity module and in the authentication centre.
  • the encryption device comprises a device for storing the encryption key.
  • the mobile station is GSM compatible.
  • Fig. 2 presents an example representing the hardware configuration of the system of the invention.
  • Fig. la illustrates a method in which the mobile communication network generates a random number RAND and sends it to the subscriber identity module 9. Based on this random number, a seed number RAND+1 is calculated.
  • This seed number 1 and the identification key Kj . 2 are input as starting values to an A3 algorithm 3.
  • the identification key K 2 is a user-specific secret parameter, which has been stored in the subscriber identity module 9 and in the authentication centre 10.
  • the A3 algorithm 3 is the same operator-specific algorithm that is used when the subscriber identity module 9 carries out an authentication procedure with the authentication centre 10 of the mobile communication network upon activation of the mobile station 8.
  • a feature characteristic of the A3 algorithm 3 is that com- puting the encryption key 4 from the seed number 1 and the identification key K ⁇ 2 is easy, but determining the identification key 2 on the basis of the seed number 1 and the encryption key 4 is extremely difficult.
  • the encryption key 4 is the result produced by the algorithm 3. This encryption key 4 is used when messages are to be encrypted and/or decrypted.
  • Fig. lb illustrates a variation of the method of the previous example.
  • the random number range is 0 - 10000. It is divided into two halves so that the random number RAND values 0 - 4999 are reserved for the computation of seed numbers 5.
  • the mobile communication network generates a random number RAND and sends it to the subscriber identity module 9. Based on the random number, a seed number RAND+5000 is calculated.
  • the seed number 5 and the identification key K L 2 are input as starting values to the A3 algorithm 3, which produces a new seed number 6 as a result.
  • the new seed number 6 thus computed and the identification key Kj . 2 are given as starting values to a new algorithm 7.
  • the result obtained is used as the final encryption key .
  • the advantage provided by this alternative is that the seed number ⁇ for the new algorithm 7 is automatically changed.
  • Fig. 2 illustrates a system in which encrypted short messages are transmitted between a GSM telephone 8 and an encryption server 12 in a GSM network.
  • An encryption device 11 has been implemented both in the subscriber identity module 9 of the mobile station 8 and in the authentication 10 of the GSM network.
  • the encryption device 11 comprises a SIM Application Toolkit, an application that computes the encryption key 4.
  • the encryption device 11 stores the compu- ted encryption key 4 for use.
  • the encryption device 11 computes an encryption key 4 on the basis of a seed number 1 and a user-specific identification key Ki 2 both on the SIM card 9 and in the authentica- tion centre 10.
  • an encryption algorithm such as an RSA or 3DES algorithm, implemented both on the SIM card and in the authentication server 12, encrypts/decrypts the message.
  • the key 4 is stored for the next time it is needed, or a new value for the key is computed each time.

Abstract

Method for computing the key to an encryption algorithm used to encrypt messages to be transmitted over a telecommunication network and for generating the seed number needed for the computation of the encryption key. According to the invention, the seed number used is a number computed from a random number generated by the authentication centre of the mobile communication network, and the encryption key is computed using the authentication algorithm from the seed number and a subscriber identification key.

Description

GENERATION OF A SEED NUMBER
The present invention relates to a method as defined in the preamble of claim 1 for computing the key to an encryption algorithm used to encrypt messages transmitted over a telecommunication network and for generating the seed number needed for the computation of the encryption key by making use of the subscriber identity module of a mobile station. Moreover, the invention relates to a system as defined in the preamble of claim 7 for computing the key to an encryption algorithm used to encrypt messages transmitted over a telecommunication network and for generating the seed number needed for the computation of the encryption key by making use of the subscriber identity module of a mobi- le station.
In the near future, it is to be expected that further applications will be designed for mobile station subscriber identity modules, such as SIM cards (Subscriber Identity Module, SIM) , in which encryption of communication is required. The encryption algorithm implementing the encryption needs an encryption key. In prior art, a method is known in which a separate algorithm for computing the encryption key is implemented in the subscriber identity module of a mobile station. In another prior-art method, the encryption key is stored on the subscriber identity module in conjunction with manufacture. In yet another previously known method, the encryption key is stored on the subscriber identity module when the latter is taken into use. A problem with the prior-art methods is that managing the seed number needed for the computation of the encryption key and/or managing the encryption key is difficult and, e.g. in solutions based on an RSA algorithm, separate equipment is needed. A further problem is that an encryption key permanently stored on the subscriber identity module is not as secure as an encryption key having a variable value. The object of the present invention is to disclose a new type of method that eliminates the problems described above. A further object of the invention is to disclose a system that can be used to implement said method.
A specific object of the present invention is to disclose a method and a system that allow flexible and safe management of seed numbers and encryption keys. As for the features characteristic of the present invention, reference is made to the claims.
In the method of the invention, the encryption key. required by the encryption algorithm used for the encryption of communication is computed from a certain seed number by making use of the subscriber identity module of the mobile station. When the mobile station is activated, its subscriber identity module performs an authentication procedure with the mobile communication network. This is done by using an operator- specific authentication algorithm and a seed number consisting of a random number RAND generated by the mobile communication network. The same authentication algorithm can be used to compute an encryption key. The seed number is a number computed on the basis of a ran- dom number RAND generated by the authentication centre AC of the mobile communication network. Using the seed number and a subscriber identification key Ki as starting values for the authentication algorithm, an application in the subscriber identity module computes the encryption key and stores it in the subscriber identity module. This encryption key is used when messages are to be encrypted and/or decrypted.
As compared with prior art, the present invention has the advantage that it makes the management of seed numbers and encryption keys considerably easier and simpler than before. As the seed numbers and encryption keys are calculated in the subscriber identity module when necessary, they need not be transmitted or set. A further advantage is that no separate equipment is needed for the management of seed numbers and encryption keys, which means that cost savings are achieved. The invention also increases security. In the met- hod of the invention, the encryption key changes continuously and it is not transmitted anywhere, thus considerably reducing the chance of its getting into the hands of outsiders.
In an embodiment of the method, a seed number is calculated from a random number RAND generated by the authentication centre, producing a seed number such as RA D+1.
In an embodiment of the method, the encryption key is computed by using an A3 algorithm, which is an operator-specific authentication algorithm.
In an embodiment of the method, one or more encryption keys are used. In this case, each application requiring encryption has its own encryption key, thus increasing security. In an embodiment of the method, the encryption key is computed by using one or more successive algorithms so that the result of the preceding algorithm is used as the seed number for the next algorithm. This provides the advantage that the seed number for the new algorithm is changed, which leads to increased security.
In an embodiment of the method, a certain portion of the random number range used by the mobile communication network is reserved for the calculation of seed numbers.
The system of the invention for computing the key to an encryption algorithm used to encrypt messages transmitted over a telecommunication network and for generating the seed number needed for the computation of the encryption key by making use of the subscriber identity module of a mobile station comprises an encryption device and means for the transmission of encrypted messages. The encryption device comprises a me- ans for computing an encryption key from a seed number. The means used to transmit encrypted messages comprise a mobile station and an encryption server.
In an embodiment of the system, an encryption device is implemented both in the subscriber identity module and in the authentication centre.
In an embodiment of the system, the encryption device comprises a device for storing the encryption key. In an embodiment of the system, the mobile station is GSM compatible.
In the following, the invention will be described by the aid of an embodiment example by referring to the attached drawings, wherein Fig. la and lb illustrate an example representing the method of the invention in the form of logic diagrams; and
Fig. 2 presents an example representing the hardware configuration of the system of the invention. Fig. la illustrates a method in which the mobile communication network generates a random number RAND and sends it to the subscriber identity module 9. Based on this random number, a seed number RAND+1 is calculated. This seed number 1 and the identification key Kj. 2 are input as starting values to an A3 algorithm 3. The identification key K 2 is a user-specific secret parameter, which has been stored in the subscriber identity module 9 and in the authentication centre 10. The A3 algorithm 3 is the same operator-specific algorithm that is used when the subscriber identity module 9 carries out an authentication procedure with the authentication centre 10 of the mobile communication network upon activation of the mobile station 8. A feature characteristic of the A3 algorithm 3 is that com- puting the encryption key 4 from the seed number 1 and the identification key K± 2 is easy, but determining the identification key 2 on the basis of the seed number 1 and the encryption key 4 is extremely difficult. The encryption key 4 is the result produced by the algorithm 3. This encryption key 4 is used when messages are to be encrypted and/or decrypted.
Fig. lb illustrates a variation of the method of the previous example. In this case, it is assumed that the random number range is 0 - 10000. It is divided into two halves so that the random number RAND values 0 - 4999 are reserved for the computation of seed numbers 5. the mobile communication network generates a random number RAND and sends it to the subscriber identity module 9. Based on the random number, a seed number RAND+5000 is calculated. The seed number 5 and the identification key KL 2 are input as starting values to the A3 algorithm 3, which produces a new seed number 6 as a result. The new seed number 6 thus computed and the identification key Kj. 2 are given as starting values to a new algorithm 7. The result obtained is used as the final encryption key . The advantage provided by this alternative is that the seed number β for the new algorithm 7 is automatically changed.
Fig. 2 illustrates a system in which encrypted short messages are transmitted between a GSM telephone 8 and an encryption server 12 in a GSM network. An encryption device 11 has been implemented both in the subscriber identity module 9 of the mobile station 8 and in the authentication 10 of the GSM network. The encryption device 11 comprises a SIM Application Toolkit, an application that computes the encryption key 4. In addition, the encryption device 11 stores the compu- ted encryption key 4 for use. When messages to be encrypted and/or decrypted are transmitted, the encryption device 11 computes an encryption key 4 on the basis of a seed number 1 and a user-specific identification key Ki 2 both on the SIM card 9 and in the authentica- tion centre 10. Based on this encryption key 4, an encryption algorithm, such as an RSA or 3DES algorithm, implemented both on the SIM card and in the authentication server 12, encrypts/decrypts the message. The key 4 is stored for the next time it is needed, or a new value for the key is computed each time.
The invention is not restricted to the examples of its embodiments described above, but many variations are possible within the scope of the inventive idea defined by the claims.

Claims

1. Method for computing the key (4) to an encryption algorithm used to encrypt messages to be transmitted over a telecommunication network and for generating the seed number (1, 5) needed for the computation of the encryption key (4) by making use of the subscriber identity module (9) of a mobile station (8), in which method the key to the encryption algorithm is computed from the seed number (1, 5) using a certain algorithm ( 3 , 7 ) , c h a r a c t e r i s e d in that
- the seed number (1, 5) used is a number computed from a random number RAND generated by the authentication centre (AC) (19) of the mobile communication network; and - using the authentication algorithm (3) of the mobile communication network, the encryption key (4) required by the encryption algorithm is computed from the seed number (1, 5) and a subscriber identification key K┬▒ (2) .
2. Method as defined in claim 1, characteri sed in that the seed number is calculated from the random number RAND generated by the authentication centre (10), producing a seed number such as RAND+1.
3. Method as defined in claim 1 or 2, c h a - racteri sed in that the encryption key (4) is computed by using an A3 algorithm (3) .
4. Method as defined in any one of claims 1 -
3, characterised in that one or more encryption keys are used.
5. Method as defined in any one of claims 1 -
4, characterised in that the encryption key is computed by using one or more successive algorithms (3, 7) in such manner that the result of the preceding algorithm (3) is used as the seed number for the next algorithm (7).
6. Method as defined in any one of claims 1 -
5 , c h a r a c t e r i s e d in that a certain portion of the random number range used by the mobile communication network is reserved for the computation of seed numbers (1, 5) .
7. System for computing the key (4) to an en- cryption algorithm used to encrypt messages to be transmitted over a telecommunication network and for generating the seed number (1, 5) needed for the computation of the encryption key by making use of the subscriber identity module (9) of a mobile station (8), said system comprising an encryption device (11) and means (8, 12) for the transmission of encrypted messages, characterised in that
- the encryption device (11) comprises a means for computing the encryption key (4) from the seed nu - ber (1, 5) ; and the means used to transmit encrypted messages comprise a mobile station (8) and an encryption server (12) .
8. System as defined in claim 7, charac- terised in that an encryption device (11) is implemented both in the subscriber identity module (9) and in the authentication centre (10).
9. System as defined in claim 7 or 8, characterised in that the encryption device (11) comprises a device for storing the encryption key (4).
10. System as defined in any one of claims 7 - 9, characterised in that the mobile station (8) is GSM compatible.
EP98958929A 1997-11-11 1998-11-11 Generation of a seed number Withdrawn EP1025739A2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI974198A FI105253B (en) 1997-11-11 1997-11-11 Generation of start value
FI974198 1997-11-11
PCT/FI1998/000879 WO1999025086A2 (en) 1997-11-11 1998-11-11 Generation of a seed number

Publications (1)

Publication Number Publication Date
EP1025739A2 true EP1025739A2 (en) 2000-08-09

Family

ID=8549914

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98958929A Withdrawn EP1025739A2 (en) 1997-11-11 1998-11-11 Generation of a seed number

Country Status (7)

Country Link
EP (1) EP1025739A2 (en)
JP (1) JP2001523064A (en)
AU (1) AU1489299A (en)
CA (1) CA2309666A1 (en)
FI (1) FI105253B (en)
NZ (1) NZ504378A (en)
WO (1) WO1999025086A2 (en)

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US7328350B2 (en) 2001-03-29 2008-02-05 Arcot Systems, Inc. Method and apparatus for secure cryptographic key generation, certification and use
GB2350981A (en) * 1999-06-11 2000-12-13 Int Computers Ltd Cryptographic key recovery
KR20010004791A (en) * 1999-06-29 2001-01-15 윤종용 Apparatus for securing user's informaton and method thereof in mobile communication system connecting with internet
FI109864B (en) 2000-03-30 2002-10-15 Nokia Corp Subscriber authentication
WO2002028020A2 (en) * 2000-09-29 2002-04-04 The Regents Of The University Of California Ad hoc network accessing using distributed election of a shared transmission schedule
US6983375B2 (en) 2001-04-13 2006-01-03 Ge Medical Technology Services, Inc. Method and system to grant indefinite use of software options resident on a device
US7424115B2 (en) 2003-01-30 2008-09-09 Nokia Corporation Generating asymmetric keys in a telecommunications system
FI120174B (en) * 2004-03-19 2009-07-15 Nokia Corp Saving data with the device
CN1747384A (en) * 2004-09-08 2006-03-15 华为技术有限公司 Authenticated key set
JP4790731B2 (en) * 2005-02-18 2011-10-12 イーエムシー コーポレイション Derived seed
JP2007019711A (en) * 2005-07-06 2007-01-25 Kyocera Mita Corp Data management apparatus and program therefor
US7925895B2 (en) 2005-02-22 2011-04-12 Kyocera Mita Corporation Data management apparatus, data management method, and storage medium
GB2512595A (en) * 2013-04-02 2014-10-08 Mastercard International Inc Integrated contactless mpos implementation
JP5847345B1 (en) * 2015-04-10 2016-01-20 さくら情報システム株式会社 Information processing apparatus, authentication method, and program

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Also Published As

Publication number Publication date
NZ504378A (en) 2002-03-28
CA2309666A1 (en) 1999-05-20
WO1999025086A2 (en) 1999-05-20
FI974198A (en) 1999-05-12
FI105253B (en) 2000-06-30
AU1489299A (en) 1999-05-31
WO1999025086A3 (en) 1999-10-28
FI974198A0 (en) 1997-11-11
JP2001523064A (en) 2001-11-20

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