Interactive Zero Knowledge Proofs are easy, you can just slap challenge-response on top of a secure public key cryptosystem and you're done. Here, let me show you...
nc nzkp2.ecsc22.hack.cert.pl 18664
This is a fixed / harder version of Non Zero Knowledge Proof challenge.
Format flagi:
ecsc{litery_cyfry_i_znaki_specjalne}.
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