Mallet

Carpenters use mallets for assembling.

We used a mallet to drive the tent pegs into the ground.

The Mallet of arms, according to the representation of it given by Father Daniel, exactly resembles the wooden instrument of that name, now in use, except in the length of the handle, it was like the hammer of arms, to be used with both hands, indeed it differed very little from that weapon in its form.

I had had no opportunity as yet of passing on Poirot’s message to Lawrence. But now, as I strolled out on the lawn, still nursing a grudge against my friend’s high-handedness, I saw Lawrence on the croquet lawn, aimlessly knocking a couple of very ancient balls about, with a still more ancient mallet.

I regularly have cause to recall a scene from a novel called Madder Music, by Peter de Vries, in which the main character, a writer who specialises in polo, hears a match announcer telling newcomers to the ground that, contrary to popular belief, the ball is struck with the side of the mallet, rather than the end.

[…] and when a couple of insurgents ran in to make the capture she malleted them with her rifle.

Its 50 H-7 2-8-8-2's (30 of which found their way onto the Union Pacific roster in 1945) were simple mainly because a tunnel in the Alleghenies would not accommodate the low-pressure cylinders of any Mallet larger than a 2-6-6-2.

Primarily a coal-hauling road from the mines of the Appalachian coalfield over the mountains to the Atlantic coast, the Norfolk & Western had long maintained that nothing could equal its superbly efficient articulated Mallet locomotives for the haulage of immense weights over mountain grades, and it continued to build steam locomotives in its shops at Roanoke until 1953.

Even if Alice and Bob's public keys are stored on a datavase, this attack will work. Mallet can intercept Alice's database inquiry, and substitute his own public key for Alice's. He can do the same to Bob.