My slides on Network Security and Steganography, presented at the Intensive Programme on Information and Communication Security (IPICS) 2010 can be downloaded below. The topics covered under Network Security are: Access Control Devices, Firewalls, Network Protection, Network Authentication Protocols, TLS, VPNs & Remote Access. The Steganography slides cover examples of: Image, Network, HTTP and Twitter Steganography. A PDF of the Network Security slides can be downloaded from here . A PDF of the Steganography slides can be downloaded from here .