...Homework 3( Classical Crypto) 1. The text I took for analysis is “It’s harder to imagine, but the “always connected, always on” model of computin g may also have to go. Not for everything—it seems likely that commercial sites w ill stay up, as will social networks and email services. It is much harder to attack sy stems that are disconnected or off. Physical and network separation may not be p erfect—contamination can still spread through bad code or data—but it’s an addit ional layer of isolation. (Of course, a 3G connection to the CPU may be harder to h alt.)Physical approaches can certainly go beyond connections between computers . Physical security has its own problems, and the ubiquity of recording devices ma kes “wearing a wire” seem almost quaint, but it certainly requires attackers to ma ke a potentially expensive investment to reach their targets. Cities currently cluste r groups of powerful people who prefer personal contact when possible, despite t he options for dispersal that the digital world keeps expanding.Physical and in-per son approaches also make it easier to return to old models of compartmentalizati on and cells, where information is shared on a need to know basis rather than rou gh classification levels. When “need to know” information travels electronically, it ’s easily intercepted, forwarded, or duplicated. Person to person contact isn’t just useful for conversation, but also for exchanging information about and keys to fut ure messages...
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