1. Martyn

    Having thought of this a bit more… though it was drafted in 1944, Article 21 of the Chicago Convention on International Civil Aviation could be used as a means for each airline to use a public key encryption scheme to digitally sign ADS-B transmissions from its aircraft such that any receiving station could check the signature against the public key of the sending station to determine the validity of the message. As it’s only signing, and not encrypting the contents, it would be backwards compatible with other aircraft that didn’t have as much need to do verification (e.g. single engine pistons in general aviation).

  2. Martyn

    The only issue with this is finding an agreed means to securely distribute the private keys to each actual airframe in an airline’s fleet.

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