On 09/10/17 18:53, Stefan Claas wrote: > My idea is to use the software minimodem between the two > Computers, connected, when required, via audio cables.
I think perhaps this is a little low-bandwidth for security updates for your OS. By the way, you could use a USB-to-serial converter and use a serial cable. The problem with USB is sharing the same USB device between multiple computers. If you always use the same converter in the same computer, it's not an infection vector. But this is still very low bandwidth. Many USB-to-serial converters can go to 0.5 Mbit/s. I think the max I've seen is 2 Mbit/s. So it's not as low as the ol' 115k2 anymore. I haven't read about SD cards being infection vectors, and they have many gigabytes. Enough for, for example, a mirror of the debian-security archive for your architecture. I do know about subverting SATA harddisks, but haven't heard about it actually being used, unlike USB. SATA sounds reasonable as well. For both SD cards and SATA harddisks, you could again use USB-to-X converters, as long as they are dedicated to your offline system. This is just my personal opinion, and should be read as ideas rather than authority (not that I claim to have any, that's precisely the point). Meanwhile, if somebody knows of a transfer method that has enough bandwidth to be able to keep a Debian system up-to-date, or a FreeBSD system alternatively, that looks better than SD-card or SATA/PATA, I'm interested as well. I'd rather have something better. My 2 cents, Peter. -- I use the GNU Privacy Guard (GnuPG) in combination with Enigmail. You can send me encrypted mail if you want some privacy. My key is available at <http://digitalbrains.com/2012/openpgp-key-peter>
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