Developing a Secure System for Mobile Phone Calls

The video discusses the vulnerabilities of call security over landlines and introduces a new secure system developed by scientists at Eunice, University of Surrey. This system encrypts speech signals throughout the entire signal path, providing enhanced security with a small module inside mobile phones. Users can choose to enable or disable encryption. The technology has been demonstrated to mobile phone companies.

What challenges do secure data systems currently face according to the text?

What is the significance of the small module inside the phone?