IP Security (IPSec)
¨Defined in RFCs 2401 to 2412
¨Runs at IP layer software version 4 & 6
¨Offers authentication of data source, confidentiality, data integrity, and protection against replays.
¨Comprised of Authentication Header (AH) and Encapsulating Security Payload(ESP), which can be used together or separately
¨Client/server must run compatible versions of IPSec