Digital certificates provide communicating parties with the assurance that they are communicating with people who truly are who they claim to be." Titel: CISSP Study Guide. pg 343. In this case, if the web server was a bank, you want to have a certificate confirming that they really are the bank before you authenticate with your username and password.

Foreign key to primary key matches are important because they represent references from one relation to another and establish the connections among these relations. Source: KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, 2001, John Wiley & Sons, Page 46.

Section: Software Development Security

Output feedback (OFB) is a DES mode of operation, not input feedback.
Source: KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten
Domains of Computer Security, John Wiley & Sons, 2001, Chapter 4: Cryptography (page 149).

Linearity: "If the sum of the weighted inputs then exceeds the threshold, the neuron will "fire" and there will be an output from that neuron. An alternative approach would be to have the output of the neuron be a linear function of the sum of the artificial neuron inputs."
Input-Output Mapping: "For example, if a specific output vector was required for a specific input where the relationship between input and output was non-linear, the neural network would be trained by applying a set of input vector."
Adaptivity: "The neural network would have then be said to have learned to provide the correct response for each input vector."
Pg. 261 Krutz: The CISSP Prep Guide