Crypto Phones consist of smartphone apps, mobile devices, personal computer or web-based Voice over Internet Protocol applications that use end-to-end encryption to ensure that only the user and the person they are communicating with can read what is sent. In order to secure what is being communicated, Crypto Phones require users to perform authentication tasks.
Research has shown that these tasks are prone to human errors, making these VoIP applications and devices highly vulnerable to man-in-the-middle and eavesdropping attacks... more
A long, technical, interesting read.
