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NEW QUESTION 32
What algorithm has been selected as the AES algorithm, replacing the DES algorithm?
- A. Blowfish
- B. Twofish
- C. Rijndael
- D. RC6
Answer: C
Explanation:
Explanation/Reference:
Explanation:
After DES was used as an encryption standard for over 20 years and it was cracked in a relatively short time once the necessary technology was available, NIST decided a new standard, the Advanced Encryption Standard (AES), needed to be put into place. In January 1997, NIST announced its request for AES candidates and outlined the requirements in FIPS PUB 197. AES was to be a symmetric block cipher supporting key sizes of 128, 192, and 256 bits. The following five algorithms were the finalists:
MARS Developed by the IBM team that created Lucifer
RC6 Developed by RSA Laboratories
Serpent Developed by Ross Anderson, Eli Biham, and Lars Knudsen
Twofish Developed by Counterpane Systems
Rijndael Developed by Joan Daemen and Vincent Rijmen
Out of these contestants, Rijndael was chosen. The block sizes that Rijndael supports are 128, 192, and
256 bits.
Rijndael works well when implemented in software and hardware in a wide range of products and environments. It has low memory requirements and has been constructed to easily defend against timing attacks.
Rijndael was NIST’s choice to replace DES. It is now the algorithm required to protect sensitive but unclassified U.S. government information.
Incorrect Answers:
A: RC6 was a finalist; however, Rijndael was selected by NIST as the AES algorithm.
B: Twofish was a finalist; however, Rijndael was selected by NIST as the AES algorithm.
B: Blowfish was not selected by NIST as the AES algorithm.
References:
Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, p. 809
NEW QUESTION 33
Which of the following is the BEST method to prevent malware from being introduced into a production environment?
- A. Purchase software from a limited list of retailers
- B. Do not permit programs, patches, or updates from the Internet
- C. Verify the hash key or certificate key of all updates
- D. Test all new software in a segregated environment
Answer: D
Explanation:
Section: Software Development Security
NEW QUESTION 34
What security model is dependent on security labels?
- A. Non-discretionary access control
- B. Label-based access control
- C. Discretionary access control
- D. Mandatory access control
Answer: D
Explanation:
With mandatory access control (MAC), the authorization of a subject’s access to an object is dependant upon labels, which indicate the subject’s clearance, and the classification or sensitivity of the object. Label-based access control is not defined. Source: 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).
NEW QUESTION 35
Which security model introduces access to objects only through programs?
- A. The Clark-Wilson model
- B. The information flow model
- C. The Bell-LaPadula model
- D. The Biba model
Answer: A
Explanation:
In the Clark-Wilson model, the subject no longer has direct access to objects but instead must access them through programs (well -formed transactions). The Clark-Wilson integrity model provides a foundation for specifying and analyzing an integrity policy for a computing system. The model is primarily concerned with formalizing the notion of information integrity. Information integrity is maintained by preventing corruption of data items in a system due to either error or malicious intent. An integrity policy describes how the data items in the system should be kept valid from one state of the system to the next and specifies the capabilities of various principals in the system. The model defines enforcement rules and certification rules.
Clark-Wilson is more clearly applicable to business and industry processes in which the integrity
of the information content is paramount at any level of classification.
Integrity goals of Clark-Wilson model:
Prevent unauthorized users from making modification (Only this one is addressed by the Biba
model).
Separation of duties prevents authorized users from making improper modifications.
Well formed transactions: maintain internal and external consistency i.e. it is a series of operations
that are carried out to transfer the data from one consistent state to the other.
The following are incorrect answers:
The Biba model is incorrect. The Biba model is concerned with integrity and controls access to
objects based on a comparison of the security level of the subject to that of the object.
The Bell-LaPdaula model is incorrect. The Bell-LaPaula model is concerned with confidentiality
and controls access to objects based on a comparison of the clearence level of the subject to the
classification level of the object.
The information flow model is incorrect. The information flow model uses a lattice where objects
are labelled with security classes and information can flow either upward or at the same level. It is
similar in framework to the Bell-LaPadula model.
References:
ISC2 Official Study Guide, Pages 325 – 327
AIO3, pp. 284 – 287
AIOv4 Security Architecture and Design (pages 338 – 342)
AIOv5 Security Architecture and Design (pages 341 – 344)
Wikipedia at: https://en.wikipedia.org/wiki/Clark-Wilson_model
NEW QUESTION 36
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