Understanding TETRA Security
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1 Understanding TETRA Security Brian Murgatroyd Tetra Association former chairman Security and Fraud Prevention Group (SFPG) Warren Systems Independent Security Consultant
2 Agenda What is communications security? Security threats to TETRA systems Overall system security measures TETRA security features Authentication Air interface encryption Terminal disabling End to end encryption
3 What is Communications Security? Ensuring that threats to a communications system are sufficiently and appropriately reduced by technical, procedural and environmental countermeasures Proportionality is vital! -only put in countermeasures for those threats that are deemed important for the business otherwise costs may be prohibitive Requires detailed analysis of threats, vulnerability and risk and a security management strategy
4 Security Threats Confidentiality? Eavesdropping, interception of radio path or network Availability? Integrity? Denial of service( jamming, switching off network natural disasters) Messages are delivered unchanged Only authorized terminals and users allowed on the system
5 Overall TETRA Security Management Strategy Develop Security management strategy plan generate system security plan based on threat and vulnerability assessment, Undertake risk assessment and gap analysis Ensure Network Management and procedures sufficient Provide technical security countermeasures to radio system Authentication, air interface encryption, terminal disabling, end to end encryption
6 Network Security IT security is vital in TETRA networks Gateways are particularly vulnerable Firewalls required at all access points to the network Network staff need vetting Users may need some degree of vetting
7 Main TETRA security countermeasures Authentication - ensures only valid subscriber units have access to the system and subscribers will only try and access the authorized system Air Interface Encryption protects all signaling, identity and traffic across the radio link Terminal disabling ensures lost and stolen terminals are not a threat to the network security End-to-End Encryption protects user s data all the way through the system with high levels of protection
8 TETRA security classes Class Encryption OTAR Authentication 1 No No Optional 2 Static key Optional Optional 3 Dynamic key Mandatory Mandatory
9 Authentication Unique secret key known only to Authentication centre and MS Authentication Centre Generate Random number (RS) K RS KS TA11 K RS TA11 KS RAND1 Challenge RS, RAND1 RES1 KS (Session key) RS (Random seed) Switch K S TA12 Generate random number (RAND1) RAND1 RES1 TA12 DCK1 Response Base station DCK XRES1 DCK1 Compare RES1 and XRES1
10 Air interface encryption protection Dispatcher Base Station Infrastructure???? XYZ 1. Authentication 3. End -to -End Encryption 2. Air Interface Encryption
11 Authentication Used to ensure that terminal is genuine and allowed on network Mutual authentication ensures that in addition to verifying the terminal, the SwMI can be trusted Authentication requires both SwMI and terminal have proof of unique secret key Successful authentication permits further security related functions to be downloaded Secret keys are provisioned securely in accordance with SFPG Recommendation 01
12 Air interface encryption As well as protecting voice, SDS and packet data transmissions: AI encryption protects voice and data payloads Also protects signalling Encrypted registration protects identities and gives anonymity Protection against replay attacks
13 Over The Air Re-keying (OTAR) Populations of terminals tend to be large and the only practical way to change encryption keys frequently is by OTAR This is done securely by using a derived cipher key or a session key to wrap the downloaded traffic key The security functionality is transparent to the user as the network provider would normally be responsible for OTAR and management of AI keys
14 Security Class 2 keys Static Cipher keys (SCKs) used as traffic keys in TMO Probably loaded manually to network and terminals May also be loaded by OTAR using session keys for wrapping Also used for protecting DMO
15 Class 3 Air Interface traffic keys Three types of traffic keys are used in class 3 systems:- Derived cipher Key (DCK) derived from authentication process and unique to each terminal used for protecting uplink, one to one calls Common Cipher Key(CCK) protects downlink group calls and ITSI on initial registration Group Cipher Key(GCK) Provides crypto separation, combined with CCK. Used on systems with multiple but operationally separate user groups
16 Disabling of terminals Vital to ensure the reduction of risk of threats to system by stolen and lost terminals Relies on the integrity of the users to report losses quickly and accurately. Disabling may be either temporary or permanent Disabling stops the terminal working as a radio and: Permanent disabling removes all keys (including secret key) Temporary disabling removes all traffic keys but allows ambience listening The network or application needs to be able to remember disable commands to terminals that are not live on the network at the time of the original command being sent.
17 Standard air interface algorithms TEA1 and TEA4 Generally exportable outside Europe. Designed for non public safety use TEA2 Only for use in Europe for public safety and military organizations. Strictly export controlled TEA3 For use by public safety and military organizations where TEA2 is not allowed. Strictly export controlled
18 End to end encryption MS Network Air interface security between MS and network End-to-end security between MS s MS Protects messages across an untrusted infrastructure Provides enhanced confidentiality over all parts of the network Protects Voice services SDS services Packet data services Key management under control of user
19 Standard end-to-end encryption algorithms There are no standard algorithms defined by SFPG but: IDEA was defined as a good candidate 64 bit block cipher algorithm for use with TETRA and test data and an example implementation was produced. However IDEA requires a license to be purchased AES-128 was defined as a good candidate 128 bit block cipher algorithm for use with TETRA and test data and an example implementation was produced. AES is license free and is an extremely popular algorithm AES-256 has now been implemented by some terminal suppliers and gives a very high level of assurance for high levels of confidentiality protection
20 Benefits of end to end encryption in combination with Air Interface encryption Air interface (AI) encryption alone and end to end encryption alone both have their limitations For most users AI security measures are completely adequate Where either the network is untrusted, or the data is extremely sensitive then end to end encryption may be used in addition as an overlay. Brings the benefit of encrypting user addresses and signalling as well as user data across the Air Interface and confidentiality of user data right across the network
21 Export control of crypto material All cryptographic material and terminals capable of encryption are subject to export control The authority has to be satisfied that the key length and algorithms used are allowed to be exported. Guidance is given in the Wassenaar arrangement but the export control authority must be approached in all cases
22 Evaluation of security mechanisms How can a system be judged secure? Evaluate threats and risks, independently if possible Ensure correct implementation of security on network Talk to other customers about their systems Ensure mobile terminals have been evaluated Use standard encryption algorithms Regular audit and inspection
23 SFPG Exists to define security aspects of TETRA in practical detail Some important Recommendations 01 - specifies file formayts when distributing keys 02 - end to end encryption 04- implementing TETRA air interface security 06- managemnt of long term keys 07- End to end encryption of SDS messages 11-End to end encryption of TETRA packet data
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