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diff --git a/src/add_vhdltbc/decrypt/inner_sbox_b.vhd b/src/add_vhdltbc/decrypt/inner_sbox_b.vhd
deleted file mode 100644
index 11c3e61..0000000
--- a/src/add_vhdltbc/decrypt/inner_sbox_b.vhd
+++ /dev/null
@@ -1,51 +0,0 @@
--- Implementation of the Lilliput-TBC tweakable block cipher by the
--- Lilliput-AE team, hereby denoted as "the implementer".
---
--- For more information, feedback or questions, refer to our website:
--- https://paclido.fr/lilliput-ae
---
--- To the extent possible under law, the implementer has waived all copyright
--- and related or neighboring rights to the source code in this file.
--- http://creativecommons.org/publicdomain/zero/1.0/
-
-library IEEE;
-library work;
-use IEEE.std_logic_1164.all;
-
-entity inner_sbox_b is
-  port(
-    sbox_i  : in  std_logic_vector(3 downto 0);
-    sbox_o : out std_logic_vector(3 downto 0)
-    );
-end inner_sbox_b;
-
-
-architecture inner_sbox_b_arch of inner_sbox_b is
-
-signal a,b,c,d,x,y,z,t 	:std_logic;
-signal c1,d1				:std_logic;
-
-begin
-
-a <= sbox_i(3);
-b <= sbox_i(2);
-c <= sbox_i(1);
-d <= sbox_i(0);
-
-
-c1 <= c xor (a and d);
-d1 <= b xor (d and c);
-
-
-x <= d xor (a and d1);
-y <= d1;
-z <= a xor (c1 and d1);
-t <= c1;
-
-sbox_o(3) <= x;
-sbox_o(2) <= y;
-sbox_o(1) <= z;
-sbox_o(0) <= t;
-                              
-end;
-