P x V
Comm(r)
chg
response
P comm , x V
comm(r)
decommit to chg
response
(x,s)
comm(chg | SID), SID
Where Comm is a perfectly private
computationally binding
trapdoor commitment
P replaces
coins with
Psrf(prefix)
(x,s)
Claim: A reset attack on transformed concurrent attack on original
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