BackScatter is the packets that are "scattered back" during a spoofed denial of service attack.
If A spoofs packets to B, then when B replies these packets will be sent to random places on the internet. If you "listen" to these packets you can determine who is being DDoS'd.
Alternatively X-Rays which are scattered by atomic nucleui (as in Rutherfords' experiment to measure the size of the nucleui) or a machine that uses BackScatter to examine an object or person.
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