CSCI 465 Data Communications and Networks Lecture 26

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Presentation transcript:

CSCI 465 Data Communications and Networks Lecture 26 Martin van Bommel CSCI 465 Data Communications & Networks

Virtual Private Network (VPN) A set of computers or secure networks interconnected in a secure way through encryption and other security protocols despite using unsecure networks Unsecure networks contain unauthorized users Need to prevent eavesdropping Proprietary solutions insufficient Little reassurance as to level of security Limited in choice of network devices CSCI 465 Data Communications & Networks

CSCI 465 Data Communications & Networks IPSec Security features part of Internet standards Authentication and encryption protocols Applications needing security include Branch office connectivity Remote access over Internet Extranet and intranet connections with partners E-commerce security CSCI 465 Data Communications & Networks

CSCI 465 Data Communications & Networks IPSec Functions Authentication Header For authentication only Encapsulating Security Payload (ESP) Combined authentication/encryption Key exchange function Either manual – systems administrator configures keys Or automated – on-demand key creation VPNs need both authentication/encryption CSCI 465 Data Communications & Networks

IPSec Tunnel Mode Provides protection to the entire IP Packet Original IP Packet is encrypted (ESP trailer) New packet is authenticated (ESP header) New outer IP header is added No routers along path will examine inner IP header

CSCI 465 Data Communications & Networks IP Security Scenario CSCI 465 Data Communications & Networks

CSCI 465 Data Communications & Networks Benefits of IPSec Provides strong security for external traffic Resistant to bypass Operates below transport layer hence transparent to applications Can be transparent to end users Can provide security for individual users if needed CSCI 465 Data Communications & Networks