If you connect to a Wi-Fi network that does not require a wireless network key,it is still secure enough to send private information because wireless networks encrypt all data anyway.

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Wi-Fi networks that don't require a wireless network key are usually open and unsecured. Data transmitted on open Wi-Fi networks can be intercepted and compromised by anyone on the network, including hackers. Additionally, not all wireless networks use encryption, and those that do may use weak encryption that can be easily cracked. Therefore, it is not safe to send private information over an open Wi-Fi network without additional security measures like a VPN.

If You Connect to a Wi-Fi Network That Does Not