FWIW HAM might require public key signing rather than MACs, since MACs are meaningless without a key.
On Mon, Aug 20, 2018 at 5:02 PM Lyndon Nerenberg <lyn...@orthanc.ca> wrote: > There is one other -- admittedly esoteric! -- place where a NULL > cipher would he useful: Amateur Radio applications. > > By law, we are forbidden from transmitting encrypted traffic, yet > there are use cases where integrity protection in the absence of > data content protection would be of benefit. > > A very common case is controlling a remote repeater site. Using > data integrity coupled with a client X.509 certificate means I can > restrict access to the "control" service at the site. It's fine > if people see the traffic in flight, since they won't be able to > authenticate to do a replay or issue their own commands. > > This is a distinct improvement over existing control schemes, which > typically use DTMF touch tone commands that anyone can trivially > figure out. > > As I said, a very niche case. It has been done before, using IPsec > AH, but that's extremely heavy weight, and a pain to configure and > maintain. It also requires a full-on IP fabric, whereas TLS can > be implemented directly on top of AX.25 sessions, which represent > the vast majority of amateur radio packet data links (which I > acknowledge puts this outside the realm of the Internet, and therefore > the IETF). > > --lyndon (VE7TFX) > > _______________________________________________ > TLS mailing list > TLS@ietf.org > https://www.ietf.org/mailman/listinfo/tls >
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