merkow ppt 12-JRM

Virtual Private Networks (VPNs)
cont.
� IPsec
� Performs both encryption and authentication to
address the inherent lack of security on IP-based
networks
� Three characteristics
� Sender authentication, message integrity, and data
confidentiality
� No modification to user applications
� Two security mechanisms
� Authentication Header (AH)
� Encapsulating Security Protocol (ESP)
© Pearson Education Information Security:
Principles and Practices 36