Distributing (and controlling) the necessary decryption seems like a helaciously difficult challenge for general/commercial aviation. Who are the authorized recievers of the ebcrypted data? How do we revoke access as time goes on? How do we handle normal key rotation (so that the adversary can't have unlimited time to crack/bruteforce the current keys)?(Not my core field, so this is SWAG-ish): There is also a separate but equally important problem of signal vs noise - isolating the signal for decryption. Doable, but fairly costly to implement, and far more brittle than I suspect would be acceptable.
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