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IPSec / IP Security
IP Security, also known as IPSec is the protocol that allows the encryption of layer 3 communications with point to point connections. IP sec uses a number of sub protocols:
Encapsulated Security Payload (ESP): encrypts content with symmetrical algorithm
Authentication Header (AH): creates checks sum and hashes a data packet
IP Comp/IP Payload Compression: compresses IP payload
Internet Key Exchange (IKE): negotiates shared secret. In transport mode, it encrypts data while in tunnel mode it encrypts packets.
Internet Security Association on Key Management Protocol (ISAKMP): This is the procedure that works with IPSec Communications. It exchanges keys and provides security association and then creates the tunnel.