1. https://goo.gl/PRkb95 https://goo.gl/PRkb95
2. https://www.w3schools.com/html/html5_audio.asp https://www.w3schools.com/html/html5_audio.asp
3. https://www.authy.com. https://www.authy.com.
4. https://www.duosecurity.com/product/methods/duo-mobile https://www.duosecurity.com/product/methods/duo-mobile
5. https://www.encapsecurity.com/ https://www.encapsecurity.com/