diff --git a/cryptography_s_des_exploring/cracking.py b/cryptography_s_des_exploring/cracking.py
index 39ada3f..28cd510 100644
--- a/cryptography_s_des_exploring/cracking.py
+++ b/cryptography_s_des_exploring/cracking.py
@@ -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.blocks import decode, decode_bytes
+from cryptography_s_des_exploring.sdes.blocks import encode, decode, decode_bytes
 
 
 def cast_to_key(number: int):
@@ -18,15 +18,19 @@ def cracking(ciphertext):
 
     start = time.monotonic()
 
+    decoded_ciphertext = list(decode_bytes(ciphertext))
+
     for n in range(0, 1024):
         key = cast_to_key(n)
 
-        decoded = decode_bytes(ciphertext)
-        decrypted = list(map(lambda b: decrypt_block(key, b), decoded))
+        decrypted = list(map(lambda b: decrypt_block(key, b), decoded_ciphertext))
 
         try:
-            decoded = decode(decrypted)
-            founded.append((key, decoded))
+            decoded_text = decode(decrypted)
+
+            if len(decrypted) == len(list(encode(decoded_text))):
+                founded.append((key, decoded_text))
+
         except UnicodeDecodeError as e:
             continue
         except binascii.Error as e: