Describe the two IPSec protocols that have been developed to provide packet-level security.
What will be an ideal response?
Two IPSec protocols have been developed to provide packet-level security. They include the following characteristics:
• Authentication Header (AH)-This authentication protocol does not provide encryption, but it does ensure the integrity and origin of the data. This is done by computing a hash-based message authentication code over the fields of the IP packet. It then stores this information in its own AH header embedded within the IP Packet. The values at both ends of the communication string must match.
• Encapsulating Security Payload (ESP)-This encryption protocol, which optionally supports authentication as well, works differently than AH. Whereas AH only adds header information to the data packet to ensure integrity and origin, ESP encrypts the data by surrounding the payload. It uses cryptographic algorithms to encrypt the data and ensures confidentiality.
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