# 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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