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Java Madness
Challenge Hey if you can get this to pass some tests you could probably have the flag.
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public class what_the_hack {
public static void main(String[] args) {
String check = "";
if(args.length != 5){
System.out.println("Almost! (;");
}
else {
for(int i = args.length - 1; i >= 0; i--){
System.out.println(i);
for(int j = args[i].length() - 1; j >= 0; j--){
check += args[i].charAt(j);
System.out.println(args[i].charAt(j));
}
}
if(check.equals("abctf is the coolest ctf")){
System.out.println("Flag: " + "ABCTF{" + args[0] + args[1] + args[2] +args[3] + args[4] + "}");
}
else{
System.out.println(check);
}
}
}
}
Solution The associated java file used a couple loops to reverse the five arguments. The key was encoded in the file as “abctfs is the coolest ctf”. After understanding what the loop did I echo 'abctf is the coolest ctf' | rev to get the key
Flag
ABCTF{ftc tselooc eht si ftcba}