diff --git a/monkey/tests/unit_tests/monkey_island/cc/server_utils/encryption/test_key_based_encryptor.py b/monkey/tests/unit_tests/monkey_island/cc/server_utils/encryption/test_key_based_encryptor.py
index 56e6565a0..d41f866a7 100644
--- a/monkey/tests/unit_tests/monkey_island/cc/server_utils/encryption/test_key_based_encryptor.py
+++ b/monkey/tests/unit_tests/monkey_island/cc/server_utils/encryption/test_key_based_encryptor.py
@@ -3,9 +3,11 @@ import pytest
 from monkey_island.cc.server_utils.encryption import KeyBasedEncryptor
 
 PLAINTEXT = "password"
+PLAINTEXT_MULTIPLE_BLOCK_SIZE = "banana" * KeyBasedEncryptor._BLOCK_SIZE
 PLAINTEXT_UTF8_1 = "slaptažodis"  # "password" in Lithuanian
 PLAINTEXT_UTF8_2 = "弟"  # Japanese
 PLAINTEXT_UTF8_3 = "ж"  # Ukranian
+
 KEY = b"\x84\xd4qA\xb5\xd4Y\x9bH.\x14\xab\xd8\xc7+g\x12\xfa\x80'%\xfd#\xf8c\x94\xb9\x96_\xf4\xc51"
 
 kb_encryptor = KeyBasedEncryptor(KEY)
@@ -22,3 +24,9 @@ def test_encrypt_decrypt_string_utf8_with_key(plaintext):
     encrypted = kb_encryptor.encrypt(plaintext)
     decrypted = kb_encryptor.decrypt(encrypted)
     assert decrypted == plaintext
+
+
+def test_encrypt_decrypt_string_multiple_block_size_with_key():
+    encrypted = kb_encryptor.encrypt(PLAINTEXT_MULTIPLE_BLOCK_SIZE)
+    decrypted = kb_encryptor.decrypt(encrypted)
+    assert decrypted == PLAINTEXT_MULTIPLE_BLOCK_SIZE