?

A. A private, secure network operated over a public and insecure network.
B. In IPSec, an encryption method in which only a packet's IP data is encrypted, not the IP headers themselves; this method allows intermediate nodes to read the source and destination addresses.
C. Was developed by Netscape in 1994 to provide security for online e-commerce transactions.
D. An integrated system of software, encryption methodologies, protocols, legal agreements, and third-party services that enables users to communicate securely through the use of digital certificates.
E. Public key container files that allow PKI system components and end users to validate a public key and identify its owner.
F. A cryptographic method that incorporates mathematical operations involving both a public key and a private key to encipher or decipher a message.
G. A cryptographic technique developed at AT&T and known as the "one-time pad," this cipher uses a set of characters for encryption operations only one time and then discards it.
H. A cryptographic operation that involves simply rearranging the values within a block based on an established pattern.
I. A software program or hardware/software appliance that allows administrators to restrict content that comes into or leaves a network-for example, restricting user access to Web sites with material that is not related to business, such as pornography or entertainment.
J. The organized research and investigation of Internet addresses owned or controlled by a target organization.

A. VPN
B. transport mode
C. SSL
D. PKI
E. digital certificate
F. asymmetric encryption
G. Vernam cipher
H. transposition cipher
I. content filter
J. footprinting