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GSM Security

GSM Security. GSM Security Provisions. Anonymity Authentication Signaling protection User data protection. Anonymity. Use of temporary Ids Use IMSI for initial authentication VLR generates a TMSI for the user Use the K c to encrypt TMSI. Authentication. GSM Triplets.

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GSM Security

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  1. GSM Security CSE 5349/7349

  2. GSM Security Provisions • Anonymity • Authentication • Signaling protection • User data protection CSE 5349/7349

  3. Anonymity • Use of temporary Ids • Use IMSI for initial authentication • VLR generates a TMSI for the user • Use the Kc to encrypt TMSI CSE 5349/7349

  4. Authentication CSE 5349/7349

  5. GSM Triplets • Authentication while roaming • Without passing the Ki • AuC generates (Rand, XRES, Kc) triplets • Passes to VLR CSE 5349/7349

  6. Triplets (cont’d) CSE 5349/7349

  7. Attacks on GSM Security • Microwave links • SIM/ME interface • Attacks on A3/8, A5/1 • Through air interface • With possession of ME • Attacks on SIM card • Optical fault induction • Partitioning attacks (IBM) • Ki can be extracted with <1000 tries CSE 5349/7349

  8. Attacks (cont’d) • False base station • GSM does unilateral authentication • DoS • Jamming the signal • Preventing the MS from communicating CSE 5349/7349

  9. 3GPP • Built on GSM • Two way authentication • Better algorithms • KASUMI • Protection of network signaling CSE 5349/7349

  10. GRPS Security CSE 5349/7349

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