Air-gapped.
Very interesting the more you look into it.
https://www.schneier.com/blog/archives/2011/05/bin_laden_maint.html https://www.schneier.com/blog/archives/2013/10/air_gaps.html
Very interesting the more you look into it.
https://www.schneier.com/blog/archives/2011/05/bin_laden_maint.html https://www.schneier.com/blog/archives/2013/10/air_gaps.html