IPsec

from The Free On-line Dictionary of Computing (8 July 2008)

IPsec

   <networking, protocol, security> ("{IP} Secure"?) A {protocol}
   that provides {security} for transmission of sensitive
   information over unprotected {networks} such as the
   {Internet}.  IPsec acts at the {network layer}, protecting and
   authenticating {IP} {packets} between participating devices
   ("peers"), such as {Cisco} {routers}.

   IETF IPsec (http://ietf.org/ids.by.wg/ipsec.html).

   (2002-05-06)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

IPSEC
       Internet Protocol SECurity (org., Internet, IETF, DES), "IPSec"