Task $3$: Decrypting an ELF File

Problem Statement: You are provided with an ELF file that has been encrypted using AES$128-$CBC$.$ You are to decrypt this file.

Your Specific Inputs:

Encrypted File Name: $"437102453\_$project$\_1\_$task$3\_$enc$\_$file.elf"

Output File Name: $"437102453\_$project$\_1\_$task$3\_$dec$\_$file.elf"

Key: $"4$ad$369022$f$630$c$2$b$"$

Your Student ID: $437102453$

Python Code Snippet:from Crypto.Cipher import AES

def decrypt$\_$aes$\_$cbc$($encrypted$\_$file, key, iv$)$:

cipher $=$ AES.new$($key$,$ AES.MODE$\_$CBC$,$ iv$)$

with open$($encrypted$\_$file, $\text{'}$rb$\text{'})$ as f:

encrypted$\_$data $=$ f$.$read$()$

decrypted$\_$data $=$ cipher.decrypt$($encrypted$\_$data$)$

return decrypted$\_$data

if $\_\_$name$\_\_=="\_\_$main$\_\_"$:

key $=$ b$\text{'}\text{'}$

iv $=$ b$\text{'}\text{'}$

encrypted$\_$file$\_$path $=""$

decrypted$\_$data $=$ decrypt$\_$aes$\_$cbc$($encrypted$\_$file$\_$path, key, iv$)$

with open$("",\text{'}$wb$\text{'})$ as f:

f$.$write$($decrypted$\_$data$)$

Expected Output: Decrypted ELF file that when executed, should print a specific secret message.