Ipsec

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Internet Protocol Security (IPsec) is a protocol suite for securing Internet Protocol (IP) communications by authenticating and encrypting each IP packet of a data stream. IPsec also includes protocols for establishing mutual authentication between agents at the beginning of the session and negotiation of cryptographic keys to be used during the session. IPsec can be used to protect data flows between a pair of hosts (e.g. computer users or servers), between a pair of security gateways (e.g. routers or firewalls), or between a security gateway and a host. Ipsec is a dual mode, end-to-end, security scheme operating between the Internet and Transport layers of the Internet Protocol Suite. It effectively acts as an additional, optional "presentation layer" considering a transport level protocol the application.