# babycryptoweb
## Prologue
Not a hard challenge, just required some playing around with the code
## Source code
```php$code = '$kkk=5;$s="e1iwZaNolJeuqWiUp6pmo2iZlKKulJqjmKeupalmnmWjVrI=";$s=base64_decode($s);$res="";for($i=0,$j=strlen($s);$i<$j;$i++){$ch=substr($s,$i,1);$kch=substr($kkk,($i%strlen($kkk))-1,1);$ch=chr(ord($ch)+ord($kch));$res.=$ch;};echo $res;';$a = $_GET['a'];$b = $_GET['b'];$code[$a] = $b;eval($code);```
## Analyzing the source code
```phpThe $a and $b, $code[$a] = $b are red herrings.$kkk=5;$s="e1iwZaNolJeuqWiUp6pmo2iZlKKulJqjmKeupalmnmWjVrI=";$s=base64_decode($s);$res="";for($i=0,$j=strlen($s);$i<$j;$i++){	$ch=substr($s,$i,1);	$kch=substr($kkk,($i%strlen($kkk))-1,1);	$ch=chr(ord($ch)+ord($kch));	$res.=$ch;};echo $res;```
## Solution
Switch ```ord($ch) + ord($kch)``` to ```ord($ch) - ord($kch)``` and get the flag!
## Flag
```F#{0n3_byt3_ru1n3d_my_encrypt1i0n!}```
