Google TOTP decode and self-generate

Pre-requirements

• An ubuntu system
  • with python3 supports
  • with python3-pip
  • with package installer, likes apt

Step1. Export TOTP

Export your TOTP from Google Authenticator by using "Transfer Codes". Take a screenshot of the generated QR-Code.

Step 2. Decode the exports

Step 2-1. Decode QR-code

• Install dependencies

  sudo apt install -y libzbar0
  
  pip install pyzbar pillow
  

• Run the script

  from pyzbar.pyzbar import decode
  from PIL import Image
  
  img = Image.open('google_auth.jpg')
  
  decoded_objects = decode(img)
  
  for obj in decoded_objects:
      print('Type:', obj.type)
      print('Data:', obj.data.decode('utf-8'), '\n')
  

• The script output should be

  Type: QRCODE
  Data: otpauth-migration://offline?data=...
  

• Just save the string after data paramater

Step 2-2. Decode URL