def bruteforce_lost_bits(result, mask, validation_func):
"""
Brute force البتات المفقودة فقط
"""
# Identify lost bits
lost_bits_mask = ~mask & 0xFFFFFFFF
preserved_bits = result & mask
candidates = []
# Try all combinations of lost bits
num_lost_bits = bin(lost_bits_mask).count('1')
for i in range(2 ** num_lost_bits):
# Reconstruct candidate key
candidate = preserved_bits
# Fill in lost bits with current iteration
bit_pos = 0
for shift in range(32):
if (lost_bits_mask >> shift) & 1:
if (i >> bit_pos) & 1:
candidate |= (1 << shift)
bit_pos += 1
# Validate candidate
if validation_func(candidate):
candidates.append(candidate)
return candidates
# Example validation: check if decryption produces valid plaintext
def validate_key(key):
"""Test if key is correct"""
test_ciphertext = 0x12345678
plaintext = test_ciphertext ^ key
# Check if plaintext looks valid
return 0x20 <= (plaintext & 0xFF) <= 0x7E # ASCII printable
# Execute attack
result = 0b00010110101011110000111101010101
mask = 0x1FFFFFF
valid_keys = bruteforce_lost_bits(result, mask, validate_key)
print(f"Found {len(valid_keys)} valid key candidates")
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