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59651
Crypto U12 (part 1), crypto for mobile telecom
Description
IYM002 (Unit 12 - Crypto Systems) Mind Map on Crypto U12 (part 1), crypto for mobile telecom, created by jjanesko on 28/04/2013.
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iym002
unit 12 - crypto systems
iym002
unit 12 - crypto systems
Mind Map by
jjanesko
, updated more than 1 year ago
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Created by
jjanesko
over 11 years ago
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Resource summary
Crypto U12 (part 1), crypto for mobile telecom
background
mobile telecom companies share operational standards
original mobile systems not secure
sent serial numbers in the clear
eavesdropping easy
cloning possible
GSM
designed by ETSI
European Telecommunications Standards Institute
improved security over original
UTMS
next step in evolution after GSM
cellular network diagram
Annotations:
http://en.wikipedia.org/wiki/Zero-knowledge_proof#Abstract_example
general design
main motivation for security: revenue protection
must be cost effective
should be as secure as the public switched telephone network and not more
adapts to evolving constraints
shifted from proprietary algorithms (GSM) to publicly known ones (UTM)
must handle noisy comm channel
UTMS
new features
mutual entity authentication
supported by AKE (similar to GSM except additonal MAC key is generated)
sequence # added for freshness and maintained by mobile device and base station
prevention of AKE triplet replay
sequence #'s prevent replay
roaming authentication upgraded to have quintlets
longer key lengths
publicly know algorithms
integrity of signalling data with a MAC
GSM
security requirements
entity authentication of the user
confidentiality on radio path
anonymity on radio path
prevents an attacker form linking the source of several calls
constraints
not excessively strong
export!
do not add to much overhead
especially on call setup
design
fully symmetric architecture
GSM closed system
fast
stream cipher
noisy comm channel
fixed encryption algorithms
proprietary algorithms
closed system
ETSI has crypto expertise
performance
crypto components
subscriber identification module (SIM)
has international mobile subscriber identity
maps user to phone
has unique 128 bit crypto key used for all crypto services
AKE (authentication and key establishment)
uses dynamic password scheme
protocols
A3
challenge response protocol
A8
generate encryption key
not shared with other access providers
special roaming scheme
comm encryption
service shared with other mobile networks
Uses standard A5/1
64 bit key, stream cipher
security analysis
popular implementation of A3 and A8 was COMP 128
designs leadked and weaknesses found
A5/1 reverse engineered
powerful attacks developed
effective because it addressed cloning and eavesdropping
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