In the view of Mike McConnell, a former spy chief, the effects of full-blown cyberwar are much like nuclear attack. Cyberwar has already started, he says, “and we are losing it.” Not so, retorts Mr Schmidt. There is no cyberwar. Bruce Schneier, an IT industry security guru, accuses securocrats like Mr Clarke of scaremongering. Cyberspace will certainly be part of any future war, he says, but an apocalyptic attack on America is both difficult to achieve technically (“movie-script stuff”) and implausible except in the context of a real war, in which case the perpetrator is likely to be obvious.

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