Reorganized

Cryptography/Rotation-Ciphers/cesarCipher_simple.py

@@ -0,0 +1,44 @@
+#!/usr/bin/env python
+
+
+__author__ = "Mari Wahl"
+__email__ = "marina.w4hl@gmail.com"
+
+'''
+Cesar Ecrypt
+'''
+
+import sys
+
+
+def encrypt(message, k):
+    alphabet = list('abcdefghijklmnopqrstuvwxyz ')
+    cipher = ''
+    for c in message:
+        cipher += alphabet[(alphabet.index(c) + k)%(len(alphabet))]
+    return cipher
+
+
+def decrypt(message, k):
+    alphabet = list('abcdefghijklmnopqrstuvwxyz ')
+    decipher = ''
+    for c in message:
+        decipher += alphabet[(alphabet.index(c) - k)%(len(alphabet))]
+    return decipher
+
+
+def main():
+    MESSAGE = list(raw_input('Enter the message to be encrypted: ')) or "all your basis belong to us"
+    k = 13
+
+    encrypted_msg = encrypt(MESSAGE, k)
+    print("Encrypted message: " + encrypted_msg)
+
+
+    decrypted_msg = decrypt(encrypted_msg, k)
+    assert(decrypted_msg == MESSAGE)
+
+
+if __name__ == '__main__':
+    main()
+