diff --git a/shadysim/shadysim.py b/shadysim/shadysim.py
index 6fc9382..3dd8eaa 100755
--- a/shadysim/shadysim.py
+++ b/shadysim/shadysim.py
@@ -114,8 +114,10 @@ class AppLoaderCommands(object):
 		# Padding if Ciphering is used
 		if ((spi_1 & 0x04) != 0): # check ciphering bit
 			len_cipher = 6 + len_sig + (len(data) / 2)
-			pad_cnt = 8 - (len_cipher % 8) # 8 Byte blocksize for DES-CBC (TODO: different padding)
-			data += '00' * pad_cnt
+			# 8 Byte blocksize for DES-CBC (TODO: different padding)
+			if len_cipher % 8 > 0:
+				pad_cnt = 8 - (len_cipher % 8)
+				data += '00' * pad_cnt
 
 		# CHL + SPI first octet
 		part_head = ('%02x' % (0x0D + len_sig)) + ('%02x' % (spi_1))