Hytera offers a feature in its DMR terminals that encrypts signaling data, i.e. data specific to the network (color code, time slot, talk group, etc.), using a 128-bit encryption key.
This feature is called OTA (Over The Air encryption)
How does OTA work?
How is it effective and what does it protect against?
I offer you an explanatory video to give you a first overview of this encryption.
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Video content:
- 00:00 Introduction
- 00:58 What is OTA ? Definition
- 01:32 The 3 types of data exchanged on a digital PMR network
- 04:40 Where to find signalling data in a voice transmission?
- 10:44 The 2 types of encryption offered by Hytera
- 12:05 Why using OTA?
- 13:29 What is the encryption algorithm used for OTA?
- 14:06 Does the OTA is defined in the DMR standard?
- 14:55 Can the OTA be hijacked?
- 16:45 By comparing Hytera OTA with Motorola RAS (Restricted Access to System), witch one is the best ?
- 18:37 How to enable the Over The Air encryption (OTA) in the CPS?
- 21:51 Demonstration of how OTA encryption works with Digital Speech Decoder (DSD)
- 29:18 Conclusion
- 30:49 The final word
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DSD (Digital Speech Decoder) sources :
https://github.com/LouisErigHerve/dsd
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Mots clefs :
PMR, DMR, dPMR, NXDN, ICOM, Motorola, Kenwood, Airbus, TETRAPOL, TETRA, ANTARES, ACROPOL, EADS, 3G, 4G, 5G, LTE, Mission Critical, Talkie-Walkie, PTT, Push To Talk, Radiocommunications, Radio FM, CiBi, CB, Radio AM, ETSI TS 102 361, DMRA, DMR Association, OTA, Over The Air Encryption