CS406: Information Security

Robocall attacks have recently emerged as massive calls coming from computers to targeted persons with known phone numbers. They target cellphones, residential, and work phones. A robocall is a device or computer program that automatically dials a list of phone numbers to deliver prerecorded messages. It is mainly based on voice over the internet protocol (VoIP) to ensure several VoIP functions such as interactive voice response and text to speech [36]. These calls can be about offering or selling services or solving problems. Helping to solve tax problems is a very known example of attack that has risen in intensity in recent years. In general, when a victim answers the call, the phone number is stored in the attacker’s database. Even after blocking these calls, attackers’ systems call from other numbers. Robocall attacks have become a serious problem in the USA and other countries. The only way for people to stop these calls is by not answering unknown phone numbers.