EP1025739A2 - Generation d'une valeur de depart - Google Patents
Generation d'une valeur de departInfo
- 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- Withdrawn
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.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI974198A FI105253B (fi) | 1997-11-11 | 1997-11-11 | Siemenluvun generointi |
FI974198 | 1997-11-11 | ||
PCT/FI1998/000879 WO1999025086A2 (fr) | 1997-11-11 | 1998-11-11 | Generation d'une valeur de depart |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1025739A2 true EP1025739A2 (fr) | 2000-08-09 |
Family
ID=8549914
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98958929A Withdrawn EP1025739A2 (fr) | 1997-11-11 | 1998-11-11 | Generation d'une valeur de depart |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1025739A2 (fr) |
JP (1) | JP2001523064A (fr) |
AU (1) | AU1489299A (fr) |
CA (1) | CA2309666A1 (fr) |
FI (1) | FI105253B (fr) |
NZ (1) | NZ504378A (fr) |
WO (1) | WO1999025086A2 (fr) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 (ko) * | 1999-06-29 | 2001-01-15 | 윤종용 | 인터넷 환경의 이동통신시스템에서 사용자 정보 보안 장치 및그 방법 |
FI109864B (fi) | 2000-03-30 | 2002-10-15 | Nokia Corp | Tilaajan autentikaatio |
WO2002028020A2 (fr) * | 2000-09-29 | 2002-04-04 | The Regents Of The University Of California | Systeme et procede d'acces de reseau ad hoc au moyen du choix reparti d'un calendrier d'emission partage |
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 (fi) | 2004-03-19 | 2009-07-15 | Nokia Corp | Tietojen tallentaminen laitteen yhteydessä |
CN1747384A (zh) * | 2004-09-08 | 2006-03-15 | 华为技术有限公司 | 验证密钥设置方法 |
JP4790731B2 (ja) * | 2005-02-18 | 2011-10-12 | イーエムシー コーポレイション | 派生シード |
US7925895B2 (en) | 2005-02-22 | 2011-04-12 | Kyocera Mita Corporation | Data management apparatus, data management method, and storage medium |
JP2007019711A (ja) * | 2005-07-06 | 2007-01-25 | Kyocera Mita Corp | データ管理装置およびそのプログラム |
GB2512595A (en) * | 2013-04-02 | 2014-10-08 | Mastercard International Inc | Integrated contactless mpos implementation |
JP5847345B1 (ja) * | 2015-04-10 | 2016-01-20 | さくら情報システム株式会社 | 情報処理装置、認証方法及びプログラム |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4797672A (en) * | 1986-09-04 | 1989-01-10 | Octel Communications Corp. | Voice network security system |
JP3080382B2 (ja) * | 1990-02-21 | 2000-08-28 | 株式会社日立製作所 | 暗号通信システム |
US5201000A (en) * | 1991-09-27 | 1993-04-06 | International Business Machines Corporation | Method for generating public and private key pairs without using a passphrase |
IL107967A (en) * | 1993-12-09 | 1996-12-05 | News Datacom Research Ltd | Apparatus and method for securing communication systems |
EP0688929B1 (fr) * | 1994-06-21 | 2004-10-13 | Microchip Technology Inc. | Auto-apprentissage protégé |
SE506619C2 (sv) * | 1995-09-27 | 1998-01-19 | Ericsson Telefon Ab L M | Metod för kryptering av information |
-
1997
- 1997-11-11 FI FI974198A patent/FI105253B/fi active
-
1998
- 1998-11-11 AU AU14892/99A patent/AU1489299A/en not_active Abandoned
- 1998-11-11 CA CA002309666A patent/CA2309666A1/fr not_active Abandoned
- 1998-11-11 WO PCT/FI1998/000879 patent/WO1999025086A2/fr not_active Application Discontinuation
- 1998-11-11 EP EP98958929A patent/EP1025739A2/fr not_active Withdrawn
- 1998-11-11 NZ NZ504378A patent/NZ504378A/en unknown
- 1998-11-11 JP JP2000519968A patent/JP2001523064A/ja not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO9925086A2 * |
Also Published As
Publication number | Publication date |
---|---|
WO1999025086A2 (fr) | 1999-05-20 |
CA2309666A1 (fr) | 1999-05-20 |
WO1999025086A3 (fr) | 1999-10-28 |
FI974198A0 (fi) | 1997-11-11 |
JP2001523064A (ja) | 2001-11-20 |
AU1489299A (en) | 1999-05-31 |
FI105253B (fi) | 2000-06-30 |
NZ504378A (en) | 2002-03-28 |
FI974198A (fi) | 1999-05-12 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4956863A (en) | Cryptographic method and apparatus for public key exchange with authentication | |
EP0841770B1 (fr) | Procédé d'émission d'un message sécurisé dans un système de télécommunications | |
US8223970B2 (en) | Message deciphering method, system and article | |
US7716483B2 (en) | Method for establishing a communication between two devices | |
US5544245A (en) | Mutual authentication/cipher key delivery system | |
CA2303048C (fr) | Procede de securite pour transmissions dans des reseaux de telecommunications | |
EP0735723B1 (fr) | Procédé et dispositif de communication cryptographique | |
US5915021A (en) | Method for secure communications in a telecommunications system | |
US5602917A (en) | Method for secure session key generation | |
CN101217362B (zh) | 一种基于动态随机化drntru公钥加密系统建立的rfid通信安全机制 | |
KR100943683B1 (ko) | 데이터 전송 안전 확보 방법, 통신 시스템 및 통신 장치 | |
US6047072A (en) | Method for secure key distribution over a nonsecure communications network | |
EP0792042A3 (fr) | Procédé de communication utilisant une clé cryptographique commune | |
WO2001001630A1 (fr) | Procedes et dispositifs permettant d'assurer une liaison securisee d'authentification d'entite et de generation de cles de chiffrement | |
US7620186B2 (en) | Method for establishing an encrypted communication by means of keys | |
WO1999025086A2 (fr) | Generation d'une valeur de depart | |
US20020199102A1 (en) | Method and apparatus for establishing a shared cryptographic key between energy-limited nodes in a network | |
FI964926A0 (fi) | Tiedonsiirron osapuolien oikeellisuuden tarkistaminen tietoliikenneverkossa | |
EP1763192A1 (fr) | Personnalisation on cascade d'un module de chiffrement de bout en bout | |
JPS6346028A (ja) | 暗号鍵配布方式 | |
Smith et al. | Identity-based cryptography for securing mobile phone calls | |
JPH0897813A (ja) | 通信方法および装置 | |
JP2565893B2 (ja) | 共有鍵生成方法 | |
CA2024049A1 (fr) | Methode et appareil de cryptographie pour l'echange d'informations au moyen d'une cle publique avec verification d'identite |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20000504 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
RAX | Requested extension states of the european patent have changed |
Free format text: LT PAYMENT 20000504 |
|
RAX | Requested extension states of the european patent have changed |
Free format text: LT PAYMENT 20000504;LV PAYMENT 20000504 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20030603 |
|
REG | Reference to a national code |
Ref country code: NL Ref legal event code: ZD Free format text: PAT. BUL. 11/2005 HEADING PD, SECTION 4, PAGE 1685, INT.CL. A42B 1/24, PATENT NO. 1025739; THE NAME OF THE INVENTOR SHOULD READ: HERMAN JACQUES MONSHOUWER TE AMÜUR BANGLAMUNG (TH). |