Tags: easyctf forensics
Rating:
Challenge: Useless Python
----------------------------------------
Category: Programming
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50 points
----------------------------------------
Description:
```
Boredom took over, so I wrote this python file! I didn't want anyone to see it though because it doesn't actually run, so I used the coolest base-16 encoding to keep it secret. python
```
useless.py
The python scrypt is encoded with base16, decoder gives me this:
exec(chr(101)+chr(120)+chr(101)+.....)
Code:
```
with open ('base16.txt', 'r') as f:
num = ''
for char in f.read():
m = char
if m != '+' and m != '(' and m != ')' and m != 'c' and m != 'h' and m != 'r':
num += m
else:
if num != '' and num != '+' and num != '(' and num != ')' and num != 'c' and num != 'h' and num != 'r':
sim = chr(int(num))
with open ('text.txt', 'a') as out:
out.write(sim)
num = ''
```
After a few iterations:
```
flag = 'easyctf{python_3x3c_exec_3xec_ex3c}'
priint flag
```
flag = 'easyctf{python_3x3c_exec_3xec_ex3c}'
