diff --git a/src/pseudo_nkode_api.py b/src/pseudo_nkode_api.py
index 84905b3..6ca01da 100644
--- a/src/pseudo_nkode_api.py
+++ b/src/pseudo_nkode_api.py
@@ -33,7 +33,6 @@ class CustomerDBModel(BaseModel):
 
         passcode_set_vals = user.user_keys.decipher_mask(
             user.enciphered_passcode.mask, self.interface.set_vals, len(selected_keys))
-
         set_vals_idx = [self.interface.get_set_index(set_val) for set_val in passcode_set_vals]
 
         presumed_selected_attributes = []
diff --git a/src/user_cipher_keys.py b/src/user_cipher_keys.py
index bc520a5..3f7e4a5 100644
--- a/src/user_cipher_keys.py
+++ b/src/user_cipher_keys.py
@@ -86,7 +86,8 @@ class UserCipherKeys(BaseModel):
     ) -> str:
         passcode_len = len(passcode_attr_idx)
         passcode_attrs = [customer_interface.customer_interface[idx] for idx in passcode_attr_idx]
-        passcode_cipher = self.pass_key
+
+        passcode_cipher = self.pass_key.copy()
 
         for idx in range(passcode_len):
             attr_idx = passcode_attr_idx[idx]
@@ -117,5 +118,3 @@ class UserCipherKeys(BaseModel):
             set_idx = set_key_ciphers.index(set_cipher)
             passcode_sets.append(set_vals[set_idx])
         return passcode_sets
-
-
diff --git a/src/user_interface.py b/src/user_interface.py
index f341c31..ae21cf1 100644
--- a/src/user_interface.py
+++ b/src/user_interface.py
@@ -10,11 +10,16 @@ class UserInterface(BaseModel):
 
     @classmethod
     def new_interface(cls, numb_sets: int, numb_keys: int):
-        return UserInterface(
-            interface_index=secure_fisher_yates_shuffle(list(range(numb_sets*numb_keys))),
+        # Todo: this a hack do a proper random interface
+        interface = UserInterface(
+            interface_index=list(range(numb_sets*numb_keys)),
             numb_sets=numb_sets,
             numb_keys=numb_keys,
         )
+        interface.disperse_interface()
+        for _ in range(10):
+            interface.shuffle_interface()
+        return interface
 
     def disperse_interface(self):
         user_interface_matrix = list_to_matrix(self.interface_index, self.numb_sets)
diff --git a/test/test_nkode_interface.py b/test/test_nkode_interface.py
index e69de29..c527821 100644
--- a/test/test_nkode_interface.py
+++ b/test/test_nkode_interface.py
@@ -0,0 +1,15 @@
+import pytest
+from src.nkode_interface import CustomerInterface
+from src.user_interface import UserInterface
+
+@pytest.mark.parametrize(
+    "numb_keys,attrs_per_key",
+    [(10, 7, )]
+)
+def test_attr_set_idx(numb_keys, attrs_per_key):
+    user_interface = UserInterface.new_interface(attrs_per_key, numb_keys)
+    customer_interface = CustomerInterface.new_interface(numb_keys, attrs_per_key)
+    for attr_idx in range(70):
+        user_interface_idx = user_interface.interface_index[attr_idx]
+
+        assert (attr_idx % attrs_per_key == user_interface_idx % attrs_per_key)