Shush Network Authentication (Shush Sherlock) is a silent, network-based mobile authentication solution that uses SIM card and mobile network operator (MNO) data to verify device and user identity without any user interaction or mobile app integration. The solution operates by leveraging data signals from the mobile carrier network — such as device IP address, SIM card attributes, and network connectivity status — to authenticate mobile devices in real time. It is designed as a replacement for SMS one-time passwords (OTPs), addressing known vulnerabilities in SMS-based authentication including interception and SIM swap attacks. Core capabilities include: - Silent Authentication: Replaces SMS OTP by using the device IP address and a unique mobile identifier to authenticate without user involvement. - SIM Swap Detection: Checks how long a SIM card has been associated with a registered device to assess whether a SIM swap has occurred. - Location Verification: Uses MNO data to verify device location and detect multiple simultaneous sessions indicative of compromise. - Number Verification: Confirms the phone number associated with the SIM card in use on the mobile network. - Device Status Monitoring: Checks whether a device has lost or regained network connectivity, including across different MNOs. - 47+ Network Attribute APIs: Exposes a range of network-level signals via API for customer use. Shush operates as a supply-side partner to mobile network operators globally, enabling banks, enterprises, and mobile app developers to consume network authentication services. No mobile app-level integration is required.