GSM Security - PowerPoint PPT Presentation

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GSM Security

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Attacks on A3/8, A5/1. Through air interface. With possession ... Better algorithms. KASUMI. Protection of network signaling. SMU. CSE 5349/7349. GRPS Security ... – PowerPoint PPT presentation

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Learn more at: https://s2.smu.edu
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Tags: gsm | kasumi | security

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Title: GSM Security


1
GSM Security
2
GSM Security Provisions
  • Anonymity
  • Authentication
  • Signaling protection
  • User data protection

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

4
Authentication
5
GSM Triplets
  • Authentication while roaming
  • Without passing the Ki
  • AuC generates (Rand, XRES, Kc) triplets
  • Passes to VLR

6
Triplets (contd)
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 lt1000 tries

8
Attacks (contd)
  • False base station
  • GSM does unilateral authentication
  • DoS
  • Jamming the signal
  • Preventing the MS from communicating

9
3GPP
  • Built on GSM
  • Two way authentication
  • Better algorithms
  • KASUMI
  • Protection of network signaling

10
GRPS Security
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