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Free SSCP Exam Braindumps

The Orange Book is founded upon which security policy model?

  1. The Biba Model
  2. The Bell LaPadula Model
  3. Clark-Wilson Model
  4. TEMPEST

Answer(s): B

Explanation:

From the glossary of Computer Security Basics:
The Bell-LaPadula model is the security policy model on which the Orange Book requirements are based. From the Orange Book definition, "A formal state transition model of computer security policy that describes a set of access control rules. In this formal model, the entities in a computer system are divided into abstract sets of subjects and objects. The notion of secure state is defined and it is proven that each state transition preserves security by moving from secure state to secure state; thus, inductively proving the system is secure. A system state is defined to be 'secure' if the only permitted access modes of subjects to objects are in accordance with a specific security policy. In order to determine whether or not a specific access mode is allowed, the clearance of a subject is compared to the classification of the object and a determination is made as to whether the subject is authorized for the specific access mode." The Biba Model is an integrity model of computer security policy that describes a set of rules. In this model, a subject may not depend on any object or other subject that is less trusted than itself. The Clark Wilson Model is an integrity model for computer security policy designed for a commercial environment. It addresses such concepts as nondiscretionary access control, privilege separation, and least privilege. TEMPEST is a government program that prevents the compromising electrical and electromagnetic signals that emanate from computers and related equipment from being intercepted and deciphered.


Reference:

RUSSEL, Deborah & GANGEMI, G.T. Sr., Computer Security Basics, O'Reilly, 1991. Also: U.S. Department of Defense, Trusted Computer System Evaluation Criteria (Orange Book), DOD 5200.28-STD. December 1985 (also available here).



Which of the following is true of two-factor authentication?

  1. It uses the RSA public-key signature based on integers with large prime factors.
  2. It requires two measurements of hand geometry.
  3. It does not use single sign-on technology.
  4. It relies on two independent proofs of identity.

Answer(s): D

Explanation:

It relies on two independent proofs of identity. Two-factor authentication refers to using two independent proofs of identity, such as something the user has (e.g. a token card) and something the user knows (a password). Two-factor authentication may be used with single sign-on.
The following answers are incorrect: It requires two measurements of hand geometry. Measuring
hand geometry twice does not yield two independent proofs.
It uses the RSA public-key signature based on integers with large prime factors. RSA encryption uses integers with exactly two prime factors, but the term "two-factor authentication" is not used in that context.
It does not use single sign-on technology. This is a detractor.
The following reference(s) were/was used to create this question:
Shon Harris AIO v.3 p.129
ISC2 OIG, 2007 p. 126



The primary service provided by Kerberos is which of the following?

  1. non-repudiation
  2. confidentiality
  3. authentication
  4. authorization

Answer(s): C

Explanation:

authentication. Kerberos is an authentication service. It can use single- factor or multi-factor authentication methods.
The following answers are incorrect:
non-repudiation. Since Kerberos deals primarily with symmetric cryptography, it does not help with non-repudiation.
confidentiality. Once the client is authenticated by Kerberos and obtains its session key and ticket, it may use them to assure confidentiality of its communication with a server; however, that is not a Kerberos service as such.
authorization. Although Kerberos tickets may include some authorization information, the meaning of the authorization fields is not standardized in the Kerberos specifications, and authorization is not a primary Kerberos service.
The following reference(s) were/was used to create this question:
ISC2 OIG,2007 p. 179-184
Shon Harris AIO v.3 152-155



There are parallels between the trust models in Kerberos and Public Key Infrastructure (PKI). When we compare them side by side, Kerberos tickets correspond most closely to which of the following?

  1. public keys
  2. private keys
  3. public-key certificates
  4. private-key certificates

Answer(s): C

Explanation:

A Kerberos ticket is issued by a trusted third party. It is an encrypted data structure that includes the service encryption key. In that sense it is similar to a public-key certificate.
However, the ticket is not the key.
The following answers are incorrect:
public keys. Kerberos tickets are not shared out publicly, so they are not like a PKI public key. private keys. Although a Kerberos ticket is not shared publicly, it is not a private key. Private keys are associated with Asymmetric crypto system which is not used by Kerberos. Kerberos uses only the Symmetric crypto system.
private key certificates. This is a detractor. There is no such thing as a private key certificate.






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