knight-ryu12

import java.io.IOException;
import java.math.BigInteger;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.security.*;
import java.security.spec.ECPrivateKeySpec;
import java.security.spec.InvalidKeySpecException;
 
import org.bouncycastle.jce.ECNamedCurveTable;
import org.bouncycastle.jce.provider.BouncyCastleProvider;