Matthew Smith @ #realworldcrypto: monoalphabetic substitution ciphers are alive... in avionics. Somehow relieved I won't be flying home from the conference!
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Replying to @raistolo1 reply 2 retweets 1 like
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Replying to @emiliaforreal
As they state in the abstract, ACARS is supposed to be plaintext. No safety issues arise because of this (while of course the research itself is interesting and I will read it avidly). Fly relaxed ;)
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Replying to @raistolo @emiliaforreal
Not quite true sadly - ACARS is used for ATC and some other safety-critical uses but has no integrity/authenticity measures. But that’s for another talk to cover!
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Replying to @tangohead @emiliaforreal
Let me get my personal avionics hero
@AndreaBarisani in this discussion. I think your definition of safety critical is a bit broad here ;)2 replies 0 retweets 0 likes -
It is quite broad admittedly. To be more specific, commercial ACARS use varies by airline but ATC in general is moving towards datalink usage. Within this, clearance exchanges happen over ACARS, for example. The big problem here is that... 1/
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Cleartext, or obfuscated as certain airlines do, ACARS is certainly not ideal. Tampering with it can certainly result in a commercial risk or complicate investigations, however I fail to see any relevant safety implication other than increased crew workload.
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It would certainly increase workload, though I do have a strong suspicion that subtle message changes would not necessarily be detected by crew. Either way, such a system really should be secured
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