Encrypted serial console

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Hello,

I am using some armv7 boards where serial console is essentially the
single one local console. There is no such things like IMPI or so. So,
I connect serial console to different PC which is located in the same
equipment box or rack to have emergency console when network down or
kernel can't boot. I know that serial console is primarily thought as
of debug tool but I have no other options.
I am little concerned about security. For instance, root password is
sent as a plain text over rs232.

If there is a way to implement some encryption over serial? Kind of
AES... Issue here that serial console is shared between getty (to
provide linux tty) and kernel (to provide dmesg output) and encryption
can't be implemented in getty only.
There could be a tty line discipline encrypting/decrypting the byte
stream. What do you think in general?

-- 
With best regards,
Matwey V. Kornilov
http://blog.matwey.name
xmpp://0x2207@xxxxxxxxx
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