I am sure I am not the first to point out that a vendor-controlled backdoor is exactly what governments around the world are asking for (whether they realise it or not) in consumer E2E-encrypted messaging services. But when itโ€™s in #TETRA and the users are the police, itโ€™s a problem? https://www.wired.com/story/tetra-radio-encryption-backdoor/
TETRA Radio Code Encryption Has a Flaw: A Backdoor

A secret encryption cipher baked into radio systems used by critical infrastructure workers, police, and others around the world is finally seeing sunlight. Researchers say it isnโ€™t pretty.

WIRED