根
顶级域
递归
权威
RR
security
Extension
DANE
privacy
qos
Local
DDoS
Service
software
app
Attack
STD
other
NSEC x1<x<x2 NSEC3 把x换成h(x) NSEC5 把h(x)再换成h2(RSA-1(h1(x)))
NSEC x1<x<x2
NSEC3 把x换成h(x)
NSEC5 把h(x)再换成h2(RSA-1(h1(x)))