OverTheWire — Natas Level 8
Level 7 → Level 8
- here we find a box, where we can input some data (numbers, alphabets, symbols)
- let’s try what it does by giving a random input say “passwd”, it says
Wrong secret - now let’s view the source code
- Oops, we can see the steps or ways in which our input is modified to match the correct secret
- the function does
bin2hex : converts binary to hex
strrev : reverses the string
base64_encode : encodes the string in base 64
and then compares it with the variable secret
if you don’t know what these are, please google them
- now all we have to do is reverse these steps (you can try this compiler)
<!DOCTYPE html>
<html>
<body><?php
$secret = "3d3d516343746d4d6d6c315669563362";
# given function
# echo bin2hex(strrev(base64_encode($secret)));# reversing the function to get the secret
echo base64_decode(strrev(hex2bin($secret)));
?></body>
</html>
- after reversing we get the secret
oubWYf2kBq, once we submit this, we get the password for the next level!!
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