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I don't know how I missed this, but turns out that that TETRA, the widely used encrypted radio network, considers their encryption algorithm so secret they only put it in hardware or a secure enclave

And turns out, a few months ago it was discovered what that was perhaps primarily hiding was the super secret key derivation function backdoor that drops the key length from 80 bits to 32 lol

https://www.cryptomuseum.com/radio/tetra/burst.htm