Post on 03-Sep-2020
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5G and other stories:evolving security in an evolving world
Steve Babbage20 June 2019
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Evolution #1
2
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First generation analog phones
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GSM: cryptography in mass market telecoms
20 June 20194
• Cryptographic authentication of the subscriber• Encryption of calls / texts on the radio linkBut …
A5/1, A5/2 (initially)64-bit key
One-way authentication
Homenetwork
Visitednetwork
Weak “example” algorithmCOMP-128
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Evolution of security
5
1G 2G 3G
Tune in and listen64-bit cipher key Increased to 128 bits
Initial encryption algorithms (stronger ones now widely deployed)
Full strength public algorithms
Record and cloneOne-way authentication Mutual authentication,
tamper-proof signallingAuthentication and key agreement algorithms
Much better example algorithm
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What’s left for attackers?
X
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5G versus tracking
IMSI catcher (Stingray)
IMSI sniffer
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The changing endpoint
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User plane integrity protection
Control plane (signalling)
User plane (content)
Encrypt
EncryptIntegrity protect
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User plane integrity protection
Control plane (signalling)
User plane (content)
Encrypt
EncryptIntegrity protect
Control plane (signalling)
User plane (content)
Rupprecht et al, https://alter-attack.net/
Integrity protect
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Quantum
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Latency
Mobile network Internet
Mobile network “Cloud” applications hosted on mobile operator sites
- more exposed sites?
Network info or capabilities exposed to applications
5G radio latency
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The SIM
• A miniature “hardware security module”
• Well made SIMs, with strong algorithms, remain highly resistant to attack
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Massive IoT
Image from ETSI slides by Dr Klaus Vedder, G&D
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Interconnect
A
C
D
B
E
A
C
D
B
E
Visited network core Home network core
SEPP SEPP
Service Based Architecture rather than point to point
interfaces
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Virtualisation
Image credit: Vijay Sharma (Techplayon)
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5G security hits the headlines
Questions?
18 20 June 2019