$(10$ points$)$ Identify $1-3$ keywords for each of the ten security principles to help you understand and remember them.

$($For example, the keywords for "Work factor" could be$,$ cost$,$ resource.$)$

$(10$ points$)$ A distributed denial$-$of$-$service $($DDoS$)$ is a type of DoS $($denial$-$of$-$service$)$ attack where the traffic used to overwhelm the target is coming from many distributed sources. This method means the attack can't be stopped just by blocking the source of traffic. Google some famous real$-$world DDoS, briefly describe two of them. For example, the GitHub attack in $2018.$