First, the harm of WiFi
1, eavesdropping. Unauthorized people eavesdrop on radio signals sent between wireless stations and AP (access point, wireless base station), which is a passive attack. Wireless LAN is easier than wired LAN, and it is not easy to be found.
2. Unauthorized access. Unauthorized access includes two ways. First, intruders can pretend to be authorized users to enter the wireless network. Second, an intruder can set up a fake AP to cheat wireless sites, and the fake AP is usually the first step of an attack. After that, the following attacks can usually be carried out: man-in-the-middle attack, which obtains online information and data of users, steals login passwords and hides information;
3. Human interference. Attackers use high-power transmitters, namely DDOS attacks. Resulting in a serious decline in user bandwidth. These various attacks make Wi-Fi unsafe, so we must pay attention to improving safety awareness in daily use.
4. harm to the body. Driving wifi devices for a long time directly affects your health. I get dizzy in the morning and feel uncomfortable.
Second, the harm of Bluetooth
1. replay attack: the attacker can record all 79 channels in the Bluetooth transmission process, and calculate the frequency hopping sequence in some way, and forge a repeat request to repeat the authorization command for replay attack.
2. Location attack: Bluetooth devices have a unique identification sequence, which makes it possible to determine the location of Bluetooth users. The attacker can identify and determine the geographical location of the attacked device. When the attacked device is in discoverable mode, even if the attacked device has established communication with other devices, the attacker can obtain the user's whereabouts through the network communication content.
3. Both Wi-Fi and Bluetooth can establish networks. Although it is convenient to use, it still faces many threats. Some types of viruses may also spread through this wireless network. We can't always open the connection during use. They are not as safe as we thought, so we must improve our safety awareness.
Extended data:
1, the modulation mode is GFSK (Gaussian Frequency Shift Keying), which can simultaneously carry out wireless communication of data and voice. The communication distance is generally 10 meter, and now the latest transmission distance can reach 50 meters.
2. Bluetooth function is everywhere, and many electronic devices such as mobile phones and computers are equipped with Bluetooth mode. Become electronic equipment software. It mainly provides data connection, file transfer and other functions.
3. The protocol used by 3.wifi is LAN protocol, with the transmission range of 100 m, the highest speed of 1 1Mbps, DSSS (direct sequence spread spectrum) and QPSK or BPSK (phase shift keying), and the bandwidth of 22MHz.
4. It mainly provides wireless Internet services, so it can often be seen in devices that need wireless mobile Internet access, such as laptops, PDA's and smart phones.
5. Bluetooth belongs to wireless personal area network, that is, point-to-point, and the relationship between them. Wifi belongs to wireless local area network, and multiple terminals transmit at the same time.