Yes, it is entirely possible to intercept unencrypted data and steal information through wireless signals. The following are specific analysis and prevention recommendations： --- ###**Technical feasibility analysis** 1. **The nature of wireless communication** Wireless signals (Wi-Fi, Bluetooth, cellular networks, etc.) are transmitted through electromagnetic waves, and can essentially be captured by any receiving device within the coverage range. If the data is not encrypted, the attacker can directly parse the content. 2. **Common attack scenarios** -**Wi-Fi network** -unencrypted HTTP traffic (such as login credentials, chat history) in public Wi-Fi can be sniffed directly through tools (such as Wireshark). -An attacker can fake a hotspot (Evil Twin) to trick users into connecting and intercept plain-text data. -** Bluetooth transmission** - The old version of the Bluetooth protocol (such as BLE 4.0 or below) may have vulnerabilities, and unencrypted file transfers (such as photos, contacts) can be intercepted. -Tools such as Ubertooth can scan and capture Bluetooth data packets. -**IOT devices** -Some smart home devices (such as cameras and sensors) use unencrypted Wi-Fi or Zigbee protocols, allowing attackers to obtain sensitive information. - **NFC/RFID** -unencrypted short-range communications (such as payment cards and access control cards) may be stolen by relay attacks. 3. **Examples of technical tools** -**Software-defined radio (SDR)**: Low-cost equipment (such as HackRF) can capture wireless signals in a wide range of frequency bands. -**Sniffing software**: Tools such as Aircrack-ng (Wi-Fi), Btlejack (Bluetooth) can parse unencrypted data packets. -**Man-in-the-middle attack (MITM)**: Redirects traffic through ARP spoofing or DNS hijacking, intercepting clear-text communications. --- ###**Actual case** -**Case 1: Public Wi-Fi theft** In 2017, security researchers discovered that the unencrypted Wi-Fi of a coffee shop chain leaked user browsing records and login information. -**Case 2: Smart Home Vulnerability** A brand of smart bulb was controlled by an attacker due to unencrypted Zigbee communication and stole home network information. --- ###**Risk prevention recommendations** 1. **Force encrypted transmission** -Use HTTPS, SSH, TLS and other encryption protocols to avoid HTTP plain text transmission. -Enable WPA3 encryption for Wi-Fi and disable outdated protocols such as WEP/WPA. -Enable forced pairing encryption for Bluetooth devices (such as BLE Secure Connections). 2. **Update and configuration** -Upgrade the device firmware in time to patch known vulnerabilities. - Turn off unused wireless functions (such as BLUETOOTH/NFC disabled when idle). 3. **Network environment protection** - Avoid transmitting sensitive data over public Wi-Fi and use VPN encrypted tunnels if necessary. -Divide independent networks (VLAN isolation) for IOT devices. 4. **Advanced protective measures** -Enable two-way authentication (such as certificate verification) to prevent man-in-the-middle attacks. -Use spectrum analysis tools to monitor abnormal wireless activity. --- ###**Legal and Ethical Warning** -**Legality**: Unauthorized interception of other people's communication data is illegal in most countries (such as the relevant provisions of the "Network Security Law" and "Criminal Law"). -**Ethical responsibility**: Security research should be carried out within the scope of authorization to avoid invasion of privacy. --- ###**Summary** Unencrypted wireless communication is equivalent to ”plain text broadcasting", and an attacker can easily intercept and steal data. Users need to actively enable the encryption mechanism and be alert to high-risk network environments. For enterprises, regular penetration testing and protocol audits are necessary security measures.