Basic security techniques
Encryption and decryption
o Mainly used to create privacy
o Private key (symmetric) needs many keys
o Public key (asymmetric) less keys required, good for short messages
Digital signature
o Handles authentication, integrity and non-repudiation
o Sign the message using encryption techniques
o Receiver decrypts the message using the senders public key
IPSec network layer security
o Provides a framework and a mechanism only
o Encryption and authentication scheme is up to the user
o Offers network layer secrecy and authentication
Sender encrypts TCP and UDP segments, ICMP and SNMP messages within IP datagram
o Defines 2 protocols at the network layer
Authentication header (AH) protocol with digital signature
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