signature problem

I will open stock account in brokers in usa.
I am not an american,
so I will use passport or international licence card copy
for present as an apprication open account papers.
By the way, Must I use same signature in apprication paper with
the signature on passport?
I want to use different signature from passport.
 
passport signature is easy to immitation,
I want to make much more complicated difficult signature.
I am not sure , is it not dangerous to use easy signature?
 
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