Compared to RSA, which of the following is true of Elliptic Curve Cryptography(ECC)?
Correct Answer: D
Section: Cryptography Explanation/Reference: The following answers are incorrect: It has been mathematically proved to be less secure. ECC has not been proved to be more or less secure than RSA. Since ECC is newer than RSA, it is considered riskier by some, but that is just a general assessment, not based on mathematical arguments. It has been mathematically proved to be more secure. ECC has not been proved to be more or less secure than RSA. Since ECC is newer than RSA, it is considered riskier by some, but that is just a general assessment, not based on mathematical arguments. It is believed to require longer key for equivalent security. On the contrary, it is believed to require shorter keys for equivalent security of RSA. Shon Harris, AIO v5 pg719 states: "In most cases, the longer the key, the more protection that is provided, but ECC can provide the same level of protection with a key size that is shorter that what RSA requires" The following reference(s) were/was used to create this question: ISC2 OIG, 2007 p. 258 Shon Harris, AIO v5 pg719
Question 227
All following observations about IPSec are correct except:
Correct Answer: D
Explanation/Reference: Source: TIPTON, Harold F & KRAUSE, MICKI, Information Security Management Handbook, 4th Edition, Volume 2, 2001, CRC Press, NY, Pages 166-167.
Question 228
RADIUS incorporates which of the following services?
Correct Answer: D
Explanation/Reference: A Network Access Server (NAS) operates as a client of RADIUS. The client is responsible for passing user information to designated RADIUS servers, and then acting on the response which is returned. RADIUS servers are responsible for receiving user connection requests, authenticating the user, and then returning all configuration information necessary for the client to deliver service to the user. RADIUS authentication is based on provisions of simple username/password credentials. These credentials are encrypted by the client using a shared secret between the client and the RADIUS server. OIG 2007, Page 513 RADIUS incorporates an authentication server and can make uses of both dynamic and static passwords. Since it uses the PAP and CHAP protocols, it also incluses static passwords. RADIUS is an Internet protocol. RADIUS carries authentication, authorization, and configuration information between a Network Access Server and a shared Authentication Server. RADIUS features and functions are described primarily in the IETF (International Engineering Task Force) document RFC2138. The term " RADIUS" is an acronym which stands for Remote Authentication Dial In User Service. The main advantage to using a RADIUS approach to authentication is that it can provide a stronger form of authentication. RADIUS is capable of using a strong, two-factor form of authentication, in which users need to possess both a user ID and a hardware or software token to gain access. Token-based schemes use dynamic passwords. Every minute or so, the token generates a unique 4-, 6- or 8-digit access number that is synchronized with the security server. To gain entry into the system, the user must generate both this one-time number and provide his or her user ID and password. Although protocols such as RADIUS cannot protect against theft of an authenticated session via some realtime attacks, such as wiretapping, using unique, unpredictable authentication requests can protect against a wide range of active attacks. RADIUS: Key Features and Benefits Features Benefits RADIUS supports dynamic passwords and challenge/response passwords. Improved system security due to the fact that passwords are not static. It is much more difficult for a bogus host to spoof users into giving up their passwords or password- generation algorithms. RADIUS allows the user to have a single user ID and password for all computers in a network. Improved usability due to the fact that the user has to remember only one login combination. RADIUS is able to: Prevent RADIUS users from logging in via login (or ftp). Require them to log in via login (or ftp) Require them to login to a specific network access server (NAS); Control access by time of day. Provides very granular control over the types of logins allowed, on a per-user basis. The time-out interval for failing over from an unresponsive primary RADIUS server to a backup RADIUS server is site-configurable. RADIUS gives System Administrator more flexibility in managing which users can login from which hosts or devices. Stratus Technology Product Brief http://www.stratus.com/products/vos/openvos/radius.htm Source: KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, 2001, John Wiley & Sons, Pages 43, 44. Also check: MILLER, Lawrence & GREGORY, Peter, CISSP for Dummies, 2002, Wiley Publishing, Inc., pages 45-46.
Question 229
Which type of control is concerned with restoring controls?
Correct Answer: B
Section: Access Control Explanation/Reference: Corrective controls are concerned with remedying circumstances and restoring controls. Detective controls are concerned with investigating what happen after the fact such as logs and video surveillance tapes for example. Compensating controls are alternative controls, used to compensate weaknesses in other controls. Preventive controls are concerned with avoiding occurrences of risks. Source: TIPTON, Hal, (ISC)2, Introduction to the CISSP Exam presentation.
Question 230
What can best be defined as a strongly protected computer that is in a network protected by a firewall (or is part of a firewall) and is the only host (or one of only a few hosts) in the network that can be directly accessed from networks on the other side of the firewall?
Correct Answer: A
The Internet Security Glossary (RFC2828) defines a bastion host as a strongly protected computer that is in a network protected by a firewall (or is part of a firewall) and is the only host (or one of only a few hosts) in the network that can be directly accessed from networks on the other side of the firewall. Source: SHIREY, Robert W., RFC2828: Internet Security Glossary, may 2000.
