Yes, it is possible to intercept unencrypted data transmitted by handheld devices through wireless signals. This attack is often called "wireless sniffing" and attackers can use special software and hardware tools to listen to and capture data packets transmitted on a wireless network. Here are a few relevant points: 1. **Unencrypted data transmission**: If the data transmitted by the device on the wireless network is not encrypted, it is relatively easy for attackers to intercept this data. This includes unencrypted Wi-Fi (such as open networks) or other wireless communication protocols. 2. **Use of sniffer tools**: Attackers can use sniffer tools (such as Wireshark) to analyze data traffic on wireless networks. These tools can capture data packets in transit. 3. **Common attack scenarios**: Wi-Fi networks, Bluetooth connections, etc. are potential targets for data interception. Open Wi-Fi networks in public places are particularly vulnerable because users often connect without considering security. 4. **Defense measures**: To prevent such attacks, it is recommended to use strong encryption wireless protocols (such as WPA3), regularly update device security patches, and use VPNs to encrypt traffic. These measures can significantly improve data security. In summary, although data interception is possible, this risk can be significantly reduced by taking appropriate security measures.