I have no doubt that smarter and better-funded militaries are planning for cyberwar. They have Internet attack tools: denial-of-service tools; exploits that would allow military intelligence to penetrate military systems; viruses and worms similar to what we see now, but perhaps country- or network-specific; and Trojans that eavesdrop on networks, disrupt operations, or allow an attacker to penetrate other networks. I believe militaries know of vulnerabilities in operating systems, generic or custom military applications, and code to exploit those vulnerabilities. It would be irresponsible for them not to.

The most obvious attack is the disabling of large parts of the Internet, although in the absence of global war, I doubt a military would do so; the Internet is too useful an asset and too large a part of the world economy. More interesting is whether militaries would disable national pieces of it. For a surgical approach, we can imagine a cyberattack against a military headquarte...

Destruction is the last thing a military wants to accomplish with a communications network. A military only wants to shut down an enemy's network if it isn't acquiring useful information. The best thing is to infiltrate enemy computers and networks, spy on them, and surreptitiously disrupt select pieces of their communications when appropriate. The next best thing is to passively eavesdrop. After that, perform traffic analysis: analyze the characteristics of communications. Only if a military can't do any of this would it consider shutting the thing down. Or if, as sometimes but rarely happens, the benefits of completely denying the enemy the communications channel outweigh the advantages of eavesdropping on it.

Cyberwar is certainly not a myth. But you haven't seen it yet, despite the attacks on Estonia. Cyberwar is warfare in cyberspace. And warfare involves massive death and destruction. When you see it, you'll know it.

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