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A Security Enhancement and Proof for AKA (Authentication and Key Agreement) Vladimir Kolesnikov Bell Labs SCN 2010

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A Security Enhancement and Proof for AKA (Authentication and Key Agreement). Vladimir Kolesnikov Bell Labs SCN 2010. Program. AKA background AKA Single-UIM property Our extension to “regular” KE. The AKA Setting. HE (Home Environment). AV. ?. SN (Serving Network). MS - PowerPoint PPT Presentation

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  • A Security Enhancement and Prooffor AKA(Authentication and Key Agreement)Vladimir KolesnikovBell LabsSCN 2010

    All Rights Reserved Alcatel-Lucent 2007,2008

    ProgramAKA backgroundAKA Single-UIM propertyOur extension to regular KE

    All Rights Reserved Alcatel-Lucent 2007,2008

    The AKA SettingAVMS(Mobile Set)SN(Serving Network)HE(Home Environment)

    All Rights Reserved Alcatel-Lucent 2007,2008

    AKA Message FlowCredential:Shared key K

    One-time Auth vector AVRAND, SQNAUTN = SQN, FK(0,SQN,RAND)XRES = FK(1,RAND)SK = FK(2,RAND)

    Obvious problem:MS does not contribute randomnessAKA Resolution:K stored on single UIMUIM keeps state (SQN)sksk

    All Rights Reserved Alcatel-Lucent 2007,2008

    Crypto-traditional Multi-UIM secuirity Users have several devices UIMs keyed with the same key improves AV management Simplified state management (SQN) More robust (simplified credential management, UIM cloning) Strict AKA deployment requirements Flow is preserved. No extra messages No extra overhead

    All Rights Reserved Alcatel-Lucent 2007,2008

    Our Multi-UIM-secure AKAIdea: do not use AKA-derived SK directly.use SK = FSK (RANDC)

    All Rights Reserved Alcatel-Lucent 2007,2008

    Multi-AKAskskRANDCFsk(RANDC)Fsk(RANDC)

    All Rights Reserved Alcatel-Lucent 2007,2008

    SecurityGive the usual game-style KE security definitionTheorem: Essential message exchange of the above Multi-AKA protocol is a secure KE protocol.


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