Python Cipher Text example

Author: OmkarPathak

Programs/P40_CipherText.py

@@ -0,0 +1,54 @@
+# Author: OMKAR PATHAK
+# This program illustrates a simple example for encrypting/ decrypting your text
+
+LETTERS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
+LETTERS = LETTERS.lower()
+
+def main():
+    message = str(input('Enter your message: '))
+    key = int(input('Enter you key [1 - 26]: '))
+    choice = input('Encrypt or Decrypt? [E/D]: ')
+
+    if choice.lower().startswith('e'):
+        print(encrypt(message, key))
+    else:
+        print(decrypt(message, key))
+
+def encrypt(message, key):
+    encrypted = ''
+    for chars in message:
+        if chars in LETTERS:
+            num = LETTERS.find(chars)
+            num += key
+            encrypted +=  LETTERS[num]
+        else:
+            encrypted += symbol
+
+    return encrypted
+
+def decrypt(message, key):
+    decrypted = ''
+    for chars in message:
+        if chars in LETTERS:
+            num = LETTERS.find(chars)
+            num -= key
+            decrypted +=  LETTERS[num]
+        else:
+            decrypted += symbol
+
+    return decrypted
+
+if __name__ == '__main__':
+    main()
+
+    # omkarpathak@omkarpathak-Inspiron-3542:~/Documents/GITs/Python-Programs/Programs$ python P40_CipherText.py
+    # Enter your message: omkar
+    # Enter you key [1 - 26]: 2
+    # Encrypt or Decrypt? [E/D]: e
+    # qomct
+    #
+    # omkarpathak@omkarpathak-Inspiron-3542:~/Documents/GITs/Python-Programs/Programs$ python P40_CipherText.py
+    # Enter your message: qomct
+    # Enter you key [1 - 26]: 2
+    # Encrypt or Decrypt? [E/D]: d
+    # omkar