Brute-force search for a hash with a specific three-byte prefix using SHA256.

brute_three_byte_prefix.py

import hashlib
import os

def find_specific_hash_collision(target_prefix_hex):
    target_prefix = bytes.fromhex(target_prefix_hex)
    attempts = 0
    while True:
        data = os.urandom(16)
        hash_object = hashlib.sha256(data)
        hash_digest = hash_object.digest()
        
        if hash_digest[:3] == target_prefix:
            print(f"Collision found after {attempts} attempts")
            print(f"Data (hex): {data.hex()}")
            print(f"SHA256 Hash: {hash_digest.hex()}")
            return data, hash_digest
        attempts += 1

target_prefix_hex = '8b7183'
find_specific_hash_collision(target_prefix_hex)