CA2391996A1 - Transfer of security association during a mobile terminal handover - Google Patents

Transfer of security association during a mobile terminal handover Download PDF

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Publication number
CA2391996A1
CA2391996A1 CA002391996A CA2391996A CA2391996A1 CA 2391996 A1 CA2391996 A1 CA 2391996A1 CA 002391996 A CA002391996 A CA 002391996A CA 2391996 A CA2391996 A CA 2391996A CA 2391996 A1 CA2391996 A1 CA 2391996A1
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CA
Canada
Prior art keywords
access
point
communication
mobile
terminal
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.)
Granted
Application number
CA002391996A
Other languages
French (fr)
Other versions
CA2391996C (en
Inventor
Juha Ala-Laurila
Harri Hansen
Juha Salvela
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Nokia Technologies Oy
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Individual
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Filing date
Publication date
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Publication of CA2391996A1 publication Critical patent/CA2391996A1/en
Application granted granted Critical
Publication of CA2391996C publication Critical patent/CA2391996C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
    • 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]
    • H04W12/043—Key management, e.g. using generic bootstrapping architecture [GBA] using a trusted network node as an anchor
    • H04W12/0433—Key management protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/06—Authentication
    • 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
    • H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
    • H04L63/0869—Network architectures or network communication protocols for network security for authentication of entities for achieving mutual authentication
    • 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
    • H04L63/16—Implementing security features at a particular protocol layer
    • H04L63/164—Implementing security features at a particular protocol layer at the network layer
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • H04W36/0038—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information of security context information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Abstract

An existing security association is re-established when a communication handover event occurs in a radio communications system such as IEEE 082.11 o r a HIPERLAN wherein the existing security association between a mobile termin al and a wireless communication network is maintained when the communication handover occurs within the network. Authentication during a handover event i s achieved by a challenge/response procedure. In accordance with the challenge/response procedure each member of a communication pair that is mad e up of a new access point and the mobile terminal that is experiencing a handover to the new access point sends a challenge to the other member of th e communication pair. Each member of the communication pair then calculates a response to its received challenge, and these responses are sent back to the other member of the communication pair. Each member of the communication pai r then compares its received response to a correct response. When these comparisons are correct, payload communication begins between the second access point and the mobile terminal.

Claims (16)

  1. Claim 1. A method (20) of providing information security when communication with a given mobile-terminal (12) is handed-over from a first access-point (14) to a second access-point (114), comprising the steps of:
    providing a communication system (10) having a plurality of access-points (14,114), each access point serving a different geographic area (18, 118) within an overall geographic area that is served by said communication system;
    providing a plurality of mobile-terminals (12) that are each physically moveable within said overall geographic area and between said different geographic areas (18,118);
    sensing (401) when said given mobile-terminal moves from a communication-influence with said first access-point into a communication-influence with said second access-point;
    responding to said sensing step by retrieving (407) security-association-parameters from said first access-point (l4), by creating (409) a security association at said second access-point (114) in accordance with said retrieved security-association parameters, and by creating a security association at said given mobile-terminal (12) in accordance with said retrieved security-association-parameters; and initiating (421) communication between said given mobile-terminal (12) and said second access-point (114) based upon said step of responding.
  2. Claim 2. The method (20) of claim 1 including the steps of:
    responding to said sensing (401) step by sending (404) an authenticate-access-point-challenge (412) from said given mobile-terminal (12) to said second access-point (114), and by sending (412) an authenticate-mobile-terminal-challenge from said second access-point {114) to said given mobile-terminal (12);
    generating (410) an authenticate-access-point response at said second access-point {114) in response to said authenticate-access-point-challenge received from said given mobile-terminal (12);

    sending (412) said authenticate-access-point-response to said given mobile-terminal;
    generating (414) an authenticate-mobile-terminal-response at said given mobile-terminal {12) in response to said authenticate-mobile-terminal-challenge received from said second access-point;
    sending (417) said authenticate-mobile-terminal=response to said second access-point;
    first-comparing (415) said authenticate-access-point-response to a correct response at said given mobile-terminal;
    second-comparing (418) said authenticate-mobile-terminal-response to a correct response at said second access-point; and initiating (420) communication between said given mobile-terminal and said second access-point based upon said first-comparing step and said second-competing step.
  3. Claim 3. The method (20) of claim 2 wherein said plurality of mobile-terminals (12) have a media access control layer and compatible physical layers, and wherein said messages are media access control messages.
  4. Claim 4. The method (20) of claim 3 wherein said messages are transmitted within a wireless LAN such as IEEE 802.11 or HIPERLAN/2 multiple access messages.
  5. Claim 5. The method (20) of claim 2 wherein said communication system (10) is a WLAN communication system wherein a security protocol is used to provide end-to-end security for data packets,
  6. Claim 6. The method (20) of claim 5 wherein said end-to-end security is provided by authenticating and/or encrypting said data packets, and wherein said security protocol provides symmetric cryptography requiring use of a same encryption and/or authentication key at both ends of a communication link.
  7. Claim 7. The method (20) of claim 6 wherein a sealable key management protocol operates to generate symmetric keys for said security protocol.
  8. Claim 8. The method (20) of claim 6 including the step of:
    providing a session dependent dynamic encryption key between said given mobile-terminal and said second access-point; and transferring an active security association from first access-point to said second access-point as said given mobile-terminal moves within communication coverage that is provided by said communication system.
  9. Claim 9. The method (20) of claim 4 including the steps of:
    providing said communications system (10) as a LAN;
    providing s server within said LAN;
    providing key management anal security association re-establishment within said LAN during a communication handover, without requiring a modification to an end-to-end security association, as communication continues during said communications handover, such that said communications handover affects only security functions between said mobile-terminal and said first and second access-points.
  10. Claim 10. The method (20) of claim 9 wherein said LAN includes Internet Protocol Security based security association between said plurality of access-points (14, 114) and said plurality of mobile-terminals (12).
  11. Claim 11. The method (20) of claim 1 wherein an authentication key is provided for both ends of a communication pair that is made up of said given mobile-terminal (12) and said first and second access-points (14, 114), said authentication key being generated by a scalable key management protocol.
  12. Claim 12. The method (20) of claim 1 wherein an authentication key or security association exists between said given mobile-terminal (12) and said first access-point (14) in accordance with a scalable key management protocol; and wherein security associations are transferred between said plurality of access-points (14, 114) in order to avoid the need for a new key exchange during a communication handover.
  13. Claim 13. The method (20) of claim 12 wherein said scalable key management protocol is IKE, and wherein security associations are transferred between said first access-point (14) and said second access-point (114) is a manner to avoid a need for a new key exchange during said communication handover from said first access-point (14) to said second access-point (114).
  14. Claim 14. The method (20) of claim 13 including the step of encrypting messages that carry the keys.
  15. Claim 15. Apparatus for maintaining a given security-association in a radio communications system (10) when a communication-handover occurs as a mobile-terminal (12) physically moves from a first geographic area (18) that is served by a first communication-access-point (14) to a second geographic area (118) that is served by a second communication-access-paint (114), said mobile-terminal (12) initially forming a first communication-pair with said first communication-access-point (14), and after said communication-handover said mobile-terminal forming a second communication-pair with said second communication-access-point (114), each member of said first communication-pair (12-14) having said given security association associated therewith, the apparatus comprising:
    first means (40) at said mobile-terminal (12) for sensing a need to initiate said communication-handover;
    second means (405) within said radio communications system (10) and responsive to said fast means (40) sensing said need to initiate said communication-handover for establishing said given, security association at said second communication-access-point (114);
    third means (403) at said mobile-terminal (12) far generating an access-point challenge as s function of said given security-association, and for sending said access-point-challenge to said second communication-access-point;
    fourth means (410) at said second communication-access-point for generating a mobile-terminal-challange as a function of said given security association established at said second communication-access-point, and for sending said mobile-terminal-challenge to said mobile-terminal;
    fourth means (414) at said mobile-terminal anal. responsive to said mobile-terminal-challenge for generating a mobile-terminal-response as a function of said given security-association, and for sending said mobile-terminal-response to said second communication-access-point;
    sixth means (409) at said second communication-access-point and responsive to said access-point-challenge for generating an access-point-response as a function of said given security-association established at said second communication-access-point, and, for sending said access-point-response to said mobile-terminal;
    seventh means at said mobile-terminal and responsive to said access-point response for determining if said access-point-response is correct as a function of said given security-association;
    eighth means (418) at said second communication-access-point (114) and responsive to said mobile-terminal-response for determining if said mobile-terminal-response is correct as a function of said given security association established at said second communication-access-point; and ninth means (420) within said radio communications system (10) and responsive to said eighth and ninth means for establishing said communication-handover when both said mobile-terminal-response and said access-paint-response are correct.
  16. Claim 16. The apparatus of claim 18 wherein paid radio communication system (10) is selected from the group IEEE 802.11 and HIPERLAN.
CA002391996A 1999-11-23 2000-11-21 Transfer of security association during a mobile terminal handover Expired - Lifetime CA2391996C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/447,761 1999-11-23
US09/447,761 US6587680B1 (en) 1999-11-23 1999-11-23 Transfer of security association during a mobile terminal handover
PCT/IB2000/001713 WO2001039538A1 (en) 1999-11-23 2000-11-21 Transfer of security association during a mobile terminal handover

Publications (2)

Publication Number Publication Date
CA2391996A1 true CA2391996A1 (en) 2001-05-31
CA2391996C CA2391996C (en) 2010-01-12

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CA002391996A Expired - Lifetime CA2391996C (en) 1999-11-23 2000-11-21 Transfer of security association during a mobile terminal handover

Country Status (14)

Country Link
US (1) US6587680B1 (en)
EP (1) EP1232662B1 (en)
JP (1) JP4639020B2 (en)
KR (1) KR100589761B1 (en)
CN (1) CN1199510C (en)
AT (1) ATE492997T1 (en)
AU (1) AU1293301A (en)
BR (1) BRPI0015774B1 (en)
CA (1) CA2391996C (en)
DE (1) DE60045421D1 (en)
DK (1) DK1232662T3 (en)
ES (1) ES2354957T3 (en)
WO (1) WO2001039538A1 (en)
ZA (1) ZA200204037B (en)

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