HackVent 2023 - [HV23.H3] Santa's Secret
Difficulty: Hard
Category: Fun
Not once, not twice, but three times Santa has hidden something in one of his gifts now!? Unbelievable…
The flag is hidden in the [HV23.20] challenge. There is a productName and productType enum for the keys.
If we manage to generate a key of name CandyCaneMachine2000 and type Premium, we get the hidden flag on activation instead.
I’ve added a check to the original solution script to continue generating until such a key is found:
public static void Main() {
while (true) {
// generate random key
String productKey = RandomProductKey();
// decode product key
CandyCaneLicense candyCane = CandyCaneLicense.Create(productKey);
if (candyCane != null) {
Console.WriteLine(productKey);
Console.WriteLine("Product key is valid");
Console.WriteLine("Expiration date: " + candyCane.ExpirationDate.ToString());
if (candyCane.ProductName == ProductLicense.ProductNames.CandyCaneMachine2000 &&
candyCane.ProductType == ProductLicense.ProductTypes.Premium) {
Console.WriteLine("Found super secret key :O");
break;
}
}
}
}
The flag is: HV23{sup3r-h1dd3n-k3yg3n-fl4g}