Network Security
ii
Table of Contents
About the Tutorial .................................................................................................................................... i
Audience .................................................................................................................................................. i
Prerequisites ............................................................................................................................................ i
Disclaimer & Copyright ............................................................................................................................. i
Table of Contents .................................................................................................................................... ii
1. NETWORK SECURITY — OVERVIEW ..................................................................................... 1
Physical Network .................................................................................................................................... 1
Network Protocol .................................................................................................................................... 2
Goals of Network Security ....................................................................................................................... 6
Achieving Network Security .................................................................................................................... 6
2. NETWORK SECURITY — APPLICATION LAYER SECURITY ....................................................... 8
E-mail Security ........................................................................................................................................ 8
PGP ....................................................................................................................................................... 13
S / MIME ............................................................................................................................................... 15
DNS Security ......................................................................................................................................... 16
Summary ............................................................................................................................................... 18
3. NETWORK SECURITY — SECURITY IN TRANSPORT LAYER .................................................. 19
Need for Transport Layer Security ......................................................................................................... 19
Secure Socket Layer (SSL) ...................................................................................................................... 20
TLS Protocol .......................................................................................................................................... 27
Secure Browsing - HTTPS ....................................................................................................................... 28
Secure Shell Protocol (SSH) ................................................................................................................... 30
Benefits & Limitations ........................................................................................................................... 32
Summary ............................................................................................................................................... 32
