Why ssl vpn12/11/2022 ![]() ![]() Some VPN implementations actually use SSL, resulting in a layered system: the VPN transfers IP packets (of the virtual network) by serializing them on a SSL connection, which itself uses TCP as a transport medium, which is built over IP packets (on the physical unprotected network). A VPN implementation requires some cryptography at some point. ![]() So VPN and SSL are not from the same level. SSL provides confidentiality, integrity (active alterations are reliably detected), and some authentication (usually server authentication, possibly mutual client-server authentication if using certificates on both sides). ![]() It requires the underlying transport medium to be "mostly reliable" (when not attacked, data bytes are transferred in due order, with no loss and no repetition). SSL (now known as TLS) is a technology which takes a bidirectional transport medium and provides a secured bidirectional medium. the Internet at large) which is logically isolated from the bigger network through non-hardware means (that's what "virtual" means): it is not that we are using distinct cables and switches rather, isolation is performed through use of cryptography. It is a generic concept which designates a part of a bigger network (e.g. ![]()
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