slow and stealthy denial of service attacks
I don't think a DOS can be stealthy......if it's denying service, are people going to notice?
A stealthy DOS is when the attack looks like a normal occurrence, and not an attack. It is not the DOS that is stealthy, it is the attack or, rather, the reason for the lack of service.
It is a very neat thing, actually. Say you have a very long, segmented fence. There are 1000000 segments, and every day 1 of those will break and stay broken for 10 seconds. You can't explore that, because it is random, and you can't try all 1000000 segments in 10 seconds. However, if you can force the dice and make a specific segment tail, you can be there and exploit it, because you know which one and when. To the external observer, however, it was just a normal, run of the mill segment fail.
It is the same concept. The failure is there, they notice it, but it is done in such a way they don't notice it is an attack.