VPN Fundamental

VPNs can provide the following:

Confidentiality (Privacy): Preventing anyone in the middle of the Internet (man in the middle) from being able to read the data

Authentication: Verifying that the sender of the VPN packet is a legitimate device and not a device used by an attacker

Data integrity: Verifying that the packet was not changed as the packet transited the Internet

Anti-replay: Preventing a man in the middle from copying and later replying the packets sent by a legitimate user, for the purpose of appearing to be a legitimate user

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