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VPN Overview

links: SPA TOC - VPN - Index

A Virtual Private Network (VPN) is a technology that establishes a secure, encrypted connection over a public network. It allows users to securely access a private network and share data remotely through public networks.

VPN-tunnel-overview.png

Communication Layer (ISO/OSI)

vpn-communication-layers.png

Quantum Key Distribution

Not that important but it was mentioned in the slides so:

  • Unconditionally secure private key encryption can be done with a one time pad (OTP). Weakness of this is, that the key has to be securely transmitted between the communication partners
  • Quantum cryptography solves this problem by enabling a unconditionally secure transmission of random bytes. Most famus example is the BB84 protocol developed in 1984.

Bridging

Used to create a virtual network between VMs on the same physical host:

vpn-bridging.png

links: SPA TOC - VPN - Index