As verbs the difference between circumvent and spoofing
is that circumvent
is to avoid or get around something; to bypass while spoofing
As a noun spoofing is
the action of the verb to spoof
to avoid or get around something; to bypass
to surround or besiege
to outwit or outsmart
The action of the verb to spoof .
(computing) A method of attacking a computer program, in which the program is modified so as to appear to be working normally when in reality it has been modified with the purpose to circumvent security mechanisms.