What BEST describes the National Security Agency-developed
Capstone?

A.
A one-way function for implementation of public key encryption

B.
A device for intercepting electromagnetic emissions

C.
A chip that implements the US Escrowed Encryption Standard

D.
The PC Card implementation of the Clipper Chip system

Explanation:
Capstone is a Very Large Scale Integration (VLSI) chip that
employs the Escrowed Encryption Standard and incorporates the
Skipjack algorithm, similar to the Clipper Chip. As such, it has a
LEAf. Capstone also supports public key exchange and digital signatures.
At this time, Capstone products have their LEAF function suppressed
and a Certifying Authority provides for key recovery.
*Answer “A device for intercepting electromagnetic emissions” is then, obviously, incorrect. For
information purposes, though, the US Government program to study and control the interception of
electromagnetic emissions that may compromise classified information is called TEMPEST.
* Answer “The PC Card implementation of the Clipper Chip system” is also, obviously, incorrect.
However, Capstone was first implemented on a PC card called
Fortezza.
* Answer “A one-way function for implementation of public key encryption” is incorrect since
Capstone is not a mathematical
function, but it incorporates mathematical functions for key
exchange, authentication and encryption.