Question

Finding First preimages:

Implement a program using python to find the first preimage of a hash function output. Finding first preimage is defined as "Given H, the attacker tries to find m1 where it has the hash value H". if H has an output of the first 10 initial hex digits of the SHA-1 hashes, write a program to find the preimage of ABCDEF0123. Specify the time needed to find the preimage M1
post the code with screenshots!

Answer 1

To find the first preimage of a hash function output in Python, you can use a brute force approach. Here's an example code using the SHA-1 algorithm and the target value 'ABCDEF0123'.

Step-by-step explanation:

To find the first preimage of a hash function output in Python, you can use a brute force approach. In this case, we want to find the preimage of the hash value 'ABCDEF0123'. We can generate random inputs, hash them using the SHA-1 algorithm, and check if the first 10 hex digits match our target value. Here's an example code:

import hashlib
import random

target = 'ABCDEF0123'

while True:
m = str(random.random()).encode('utf-8')
hashed = hashlib.sha1(m).hexdigest()
if hashed[:10] == target:
break

print('First preimage found:', m)

This code will keep generating random inputs, hashing them, and checking if the first 10 hex digits match the target value. The process will continue until a match is found. Please note that the time needed to find the preimage can vary depending on the computational power and the probability of finding a match.