diff --git a/MillerRabin.py b/MillerRabin.py
index 8f89609..60ce292 100644
--- a/MillerRabin.py
+++ b/MillerRabin.py
@@ -1,3 +1,6 @@
+
+# Copyright (C) 2019, 2020 Hesham T. Banafa
+
 #From: https://stackoverflow.com/questions/17298130/working-with-large-primes-in-python
 from random import randrange
 def is_prime(n, k=10):
diff --git a/OAEP.py b/OAEP.py
index ceadac5..5d1e749 100644
--- a/OAEP.py
+++ b/OAEP.py
@@ -1,3 +1,5 @@
+# Copyright (C) 2019, 2020 Hesham T. Banafa
+
 #From: https://stackoverflow.com/questions/39964383/implementation-of-i2osp-and-os2ip
 
 def i2osp(x, xLen):
diff --git a/encodetest.py b/encodetest.py
index 970d22b..432cc6e 100644
--- a/encodetest.py
+++ b/encodetest.py
@@ -1,5 +1,7 @@
 #!/usr/bin/python3
 
+# Copyright (C) 2019, 2020 Hesham T. Banafa
+
 s = 'test message hello awdawd'
 print(s)
 s_number = int.from_bytes(s.encode('utf-8'),'little')
diff --git a/rsa.py b/rsa.py
index d534067..6362e93 100755
--- a/rsa.py
+++ b/rsa.py
@@ -1,5 +1,7 @@
 #!/usr/bin/python3
 
+# Copyright (C) 2019, 2020 Hesham T. Banafa
+
 #program to generate rsa key pair using methods in EE-305
 # Hesham Banafa