# Possibility of wireless signal data interception Yes, in theory, it is indeed possible to intercept unencrypted data transmitted by handheld devices through wireless signals. This risk is real. ## Main risk scenarios -**unencrypted Wi-Fi network**: When the device is connected to a public Wi-Fi that does not use WPA/WPA2/WPA3 encryption, the data is actually transmitted in clear text. -**unencrypted Bluetooth communication**: A low-security Bluetooth connection may allow data to be intercepted -**Man-in-the-middle attack**: An attacker can establish a fake access point, induce a device to connect and intercept traffic -**Packet sniffing**: In a shared network, special software can capture data packets on the network ## Common protective measures 1. Ensure websites and applications that use the HTTPS protocol 2. Avoid transmitting sensitive information on public Wi-Fi 3. Encrypt your network connection with a VPN 4. Keep the device operating system and applications updated 5. Enable two-factor authentication Modern devices and applications are increasingly adopting encrypted communication by default, but for some older devices or applications, risks still exist.