KKlochko/cryptography-s-des-exploring
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Update the cracking for S-DES to remove the wrong decoded texts.
continuous-integration/drone/push Build is passing
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KKlochko
2023-12-19 12:14:12 +02:00
parent 8cbd5d5c1f
commit 8a914a741d
1 changed files with 9 additions and 5 deletions
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cryptography_s_des_exploring/cracking.py
+9 -5
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@@ -5,7 +5,7 @@ from rich.prompt import Prompt
from cryptography_s_des_exploring.sdes.decrypt import decrypt_block from cryptography_s_des_exploring.sdes.decrypt import decrypt_block
from cryptography_s_des_exploring.sdes.blocks import decode, decode_bytes from cryptography_s_des_exploring.sdes.blocks import encode, decode, decode_bytes
def cast_to_key(number: int): def cast_to_key(number: int):
@@ -18,15 +18,19 @@ def cracking(ciphertext):
start = time.monotonic() start = time.monotonic()
decoded_ciphertext = list(decode_bytes(ciphertext))
for n in range(0, 1024): for n in range(0, 1024):
key = cast_to_key(n) key = cast_to_key(n)
decoded = decode_bytes(ciphertext) decrypted = list(map(lambda b: decrypt_block(key, b), decoded_ciphertext))
decrypted = list(map(lambda b: decrypt_block(key, b), decoded))
try: try:
decoded = decode(decrypted) decoded_text = decode(decrypted)
founded.append((key, decoded))
if len(decrypted) == len(list(encode(decoded_text))):
founded.append((key, decoded_text))
except UnicodeDecodeError as e: except UnicodeDecodeError as e:
continue continue
except binascii.Error as e: except binascii.Error as e: