Added message encoder-decoder

Tech stack py

Author: iamrahul8

scripts/Message Encoder and Decoder/README.md

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+# Message Encoder and Decoder
+
+A web application used to encrypt and decrypt text messages. 
+- For the encodings listed in RFC 4648, it offers encoding and decoding functions.
+
+## Tech Stack 🛠
+![Python](https://img.shields.io/badge/Python-3.9-yellowgreen)
+![Streamlit](https://img.shields.io/badge/Streamlit-0.85.1-red)
+![base64](https://img.shields.io/badge/-base64-lightgrey)
+
+## Features ⚡
+
+- Encoding and Decoding using Private Key
+- Neat and Clean UI
+
+## Demo 👀
+
+[streamlit-app-encode-decode.webm](https://user-images.githubusercontent.com/81156510/183291295-e759eb45-0c1c-4d4e-9f5a-e2f3f95f8a72.webm)
+
+<hr>

scripts/Message Encoder and Decoder/app.py

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+import streamlit as st
+import base64
+
+# Function to Encode
+
+def Encode(key, message):
+ enc=[]
+ for i in range(len(message)):
+ key_c = key[i % len(key)]
+ enc.append(chr((ord(message[i]) + ord(key_c)) % 256))
+ 
+ return base64.urlsafe_b64encode("".join(enc).encode()).decode()
+
+
+# Function to decode
+
+def Decode(key, message):
+ dec=[]
+ message = base64.urlsafe_b64decode(message).decode()
+ for i in range(len(message)):
+ key_c = key[i % len(key)]
+ dec.append(chr((256 + ord(message[i])- ord(key_c)) % 256))
+ 
+ return "".join(dec)
+
+message = st.text_input('Message Text')
+
+key = st.text_input(
+ "Private key", type="password"
+)
+
+mode = st.selectbox(
+ "What action would you like to perform?",
+ ("Encode", "Decode")
+)
+
+if st.button('Result'):
+ if (mode == "Encode"):
+ # Encode(key, message)
+ st.write(Encode(key, message))
+ else:
+ st.write(Decode(key, message))
+else:
+ st.write('Please enter all the required information!!')
+