In public wireless networks, there is indeed the possibility of intercepting sensitive information of others through technical means. The following are some common attack methods and preventive measures： ### Common attack methods 1. **Man-in-the-Middle Attack (MITM)**： -**Principle**: An attacker pretends to be a legitimate wireless access point (such as a Wi-Fi hotspot) to trick users into connecting to this fake network. Once the user is connected, an attacker can intercept, tamper with, or steal the user's communication data. -**Means**: An attacker may use tools such as `Wireshark`, `Ettercap', etc. to capture and analyze network traffic. 2. **Packet Sniffing (Packet Sniffing)**： -**Principle**: An attacker uses a tool to capture data packets transmitted in the network. If these data packets are not encrypted, the attacker can directly read the sensitive information in them, such as user names, passwords, bank card information, etc. -*****: Common sniffing tools include `Wireshark`,'tcpdump`, etc. 3. **DNS spoofing (DNS Spoofing)**： -**Principle**: By tampering with the DNS response, an attacker directs the user to a malicious website, thereby stealing the user's sensitive information. -**Means**: An attacker may use tools such as `DNSspoof` to carry out this attack. ### Precautions 1. **Use a virtual private network (VPN)**： -VPN can encrypt all your network traffic, even if an attacker intercepts the data packet, it cannot decrypt the content. 2. **Make sure to use HTTPS**： -When visiting a website, make sure that the URL starts with `https://`, which means that the connection is encrypted and can prevent man-in-the-middle attacks. 3. **Avoid using unsecured public Wi-Fi**： - Try to avoid sensitive operations on public Wi-Fi, such as online banking, shopping, etc. If you must use it, try to connect via VPN. 4. **Enable firewall and anti-virus software**： - Make sure that firewalls and anti-virus software are enabled on your device to prevent malware attacks. 5. **Disable automatic connection**： - Turn off the automatic connection Wi-Fi function of the device to avoid the device automatically connecting to an unsecured network. 6. **Regularly update software and systems**： - Make sure your operating system and applications are up-to-date to reduce the exploitation of known vulnerabilities. ### Summary In public wireless networks, there is indeed a risk of intercepting sensitive information of others through technical means. This risk can be greatly reduced by taking appropriate preventive measures, such as using a VPN, ensuring an HTTPS connection, and avoiding the use of unsecured public Wi-Fi. Network security is an ongoing process, and maintaining vigilance and taking necessary protective measures are the key to protecting sensitive personal information.