Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Presence proofs (length-2 and longer) and their generation. The attack also infers the frequency of each proof. When the frequency cannot be uniquely determined, the attack derives an upper bound and a lower bound for the frequency (as shown for the rightmost proof of length 3). A proof of length l is generated by combining two proofs of length l-1 that differ in exactly one genotype
