Explanation/Reference:
The lattice is a mechanism use to implement Mandatory Access Control (MAC) Under Mandatory Access Control (MAC) you have:
Mandatory Access Control
Under Non Discretionary Access Control (NDAC) you have:
Rule-Based Access Control
Role-Based Access Control
Under Discretionary Access Control (DAC) you have:
Discretionary Access Control
The Lattice Based Access Control is a type of access control used to implement other access control method. A lattice is an ordered list of elements that has a least upper bound and a most lower bound.
The lattice can be used for MAC, DAC, Integrity level, File Permission, and more For example in the case of MAC, if we look at common government classifications, we have the following:
TOP SECRET
SECRET -----------------------I am the user at secret
CONFIDENTIAL
SENSITIVE BUT UNCLASSIFIED
UNCLASSIFIED
If you look at the diagram above where I am a user at SECRET it means that I can access document at lower classification but not document at TOP SECRET. The lattice is a list of ORDERED ELEMENT, in this case the ordered elements are classification levels. My least upper bound is SECRET and my most lower bound is UNCLASSIFIED.
However the lattice could also be used for Integrity Levels such as:
VERY HIGH
HIGH
MEDIUM ----------I am a user, process, application at the medium level
LOW
VERY LOW
In the case of of Integrity levels you have to think about TRUST. Of course if I take for example the the VISTA operating system which is based on Biba then Integrity Levels would be used. As a user having access to the system I cannot tell a process running with administrative privilege what to do. Else any users on the system could take control of the system by getting highly privilege process to do things on their behalf. So no read down would be allowed in this case and this is an example of the Biba model.
Last but not least the lattice could be use for file permissions:
RWX
RW ---------User at this level
R
If I am a user with READ and WRITE (RW) access privilege then I cannot execute the file because I do not have execute permission which is the X under linux and UNIX.
Many people confuse the Lattice Model and many books says MAC = LATTICE, however the lattice can be use for other purposes.
There is also Role Based Access Control (RBAC) that exists out there. It COULD be used to simulate MAC but it is not MAC as it does not make use of Label on objects indicating sensitivity and categories.
MAC also require a clearance that dominates the object.
You can get more info about RBAC at:http://csrc.nist.gov/groups/SNS/rbac/faq.html#03 Also note that many book uses the same acronym for Role Based Access Control and Rule Based Access Control which is RBAC, this can be confusing.
The proper way of writing the acronym for Rule Based Access Control is RuBAC, unfortunately it is not commonly used.
References:
There is a great article on technet that talks about the lattice in VISTA:
http://blogs.technet.com/b/steriley/archive/2006/07/21/442870.aspx
also see:
KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, John Wiley & Sons, 2001, Chapter 2: Access control systems (page 33).
and
http://www.microsoft-watch.com/content/vista/gaging_vistas_integrity.html

A prolonged power supply that is below normal voltage is a brownout.
From: HARRIS, Shon, All-In-One CISSP Certification Exam Guide, 3rd. Edition McGraw-Hill/Osborne, 2005, page 368.

Systems accountability depends on the ability to ensure that senders cannot deny sending information and that receivers cannot deny receiving it. Because the mechanisms implemented in nonrepudiation prevent the ability to successfully repudiate an action, it can be considered as a preventive control. Source: STONEBURNER, Gary, NIST Special Publication 800-33: Underlying Technical Models for Information Technology Security, National Institute of Standards and Technology, December 2001, page 7.

Section: Security Operation Adimnistration
Explanation
Explanation/Reference:
Regression testing is the process of rerunning a portion of the test scenario or test plan to ensure that changes or corrections have not introduced new errors. The data used in regression testing should be the same as the data used in the original test. Unit testing refers to the testing of an individual program or module. Pilot testing is a preliminary test that focuses only on specific and predetermined aspects of a system. Parallel testing is the process of feeding test data into two systems and comparing the results.
Source: Information Systems Audit and Control Association, Certified Information Systems Auditor 2002 review manual, Chapter 6: Business Application System Development, Acquisition, Implementation and Maintenance (page 300).