熱門的CISSP最新考證|第一次嘗試輕鬆學習並通過考試和免費下載的CISSP：Certified Information Systems Security Professional

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最新的 ISC Certification CISSP 免費考試真題 (Q600-Q605):

問題 #600
Which of the following is not an encryption algorithm?

A. Twofish
B. Skipjack
C. SHA-1
D. DEA

答案：C

解題說明：
The SHA-1 is a hashing algorithm producing a 160-bit hash result from any data. It does not perform encryption.
In cryptography, SHA-1 is a cryptographic hash function designed by the United States
National Security Agency and published by the United States NIST as a U.S. Federal
Information Processing Standard.
SHA stands for "secure hash algorithm". The four SHA algorithms are structured differently and are distinguished as SHA-0, SHA-1, SHA-2, and SHA-3. SHA-1 is very similar to SHA-
0, but corrects an error in the original SHA hash specification that led to significant weaknesses. The SHA-0 algorithm was not adopted by many applications. SHA-2 on the other hand significantly differs from the SHA-1 hash function.
SHA-1 is the most widely used of the existing SHA hash functions, and is employed in several widely used applications and protocols.
In 2005, cryptanalysts found attacks on SHA-1 suggesting that the algorithm might not be secure enough for ongoing use. NIST required many applications in federal agencies to move to SHA-2 after 2010 because of the weakness. Although no successful attacks have yet been reported on SHA-2, they are algorithmically similar to SHA-1.
In 2012, following a long-running competition, NIST selected an additional algorithm,
Keccak, for standardization as SHA-3
NOTE:
A Cryptographic Hash Function is not the same as an Encryption Algorithm even thou both are Algorithms. An algorithm is defined as a step-by-step procedure for calculations.
Hashing Algorithm do not encrypt the data. People sometimes will say they encrypted a password with SHA-1 but really they simply created a Message Digest of the password using SHA-1, putting the input through a series of steps to come out with the message digest or hash value.
A cryptographic hash function is a hash function; that is, an algorithm that takes an arbitrary block of data and returns a fixed-size bit string, the (cryptographic) hash value, such that any (accidental or intentional) change to the data will (with very high probability) change the hash value. The data to be encoded are often called the "message," and the hash value is sometimes called the message digest or simply digest.
Encryption Algorithms are reversible but Hashing Algorithms are not meant to be reversible if the input is large enough.
The following are incorrect answers:
The Skipjack algorithm is a Type II block cipher with a block size of 64 bits and a key size of 80 bits that was developed by NSA and formerly classified at the U.S. Department of
Defense "Secret" level.
Twofish is a freely available 128-bit block cipher designed by Counterpane Systems (Bruce
Schneier et al.).
DEA is a symmetric block cipher, defined as part of the U.S. Government's Data Encryption
Standard (DES). DEA uses a 64-bit key, of which 56 bits are independently chosen and 8 are parity bits, and maps a 64-bit block into another 64-bit block.
Reference(s) used for this question:
http://en.wikipedia.org/wiki/SHA-1
and
SHIREY, Robert W., RFC2828: Internet Security Glossary, may 2000.
and
Counterpane Labs, at http://www.counterpane.com/twofish.html.

問題 #601
When preparing a business continuity plan, who of the following is responsible for identifying and prioritizing time-critical systems?

A. Senior business unit management
B. Executive management staff
C. Functional business units
D. BCP committee

答案：A

解題說明：
Many elements of a BCP will address senior management, such as the statement of importance and priorities, the statement of organizational responsibility, and the statement of urgency and timing. Executive management staff initiates the project, gives final approval and gives ongoing support. The BCP committee directs the planning, implementation, and tests processes whereas functional business units participate in implementation and testing. Source: KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, John Wiley & Sons, 2001, Chapter 8: Business Continuity Planning and Disaster Recovery Planning (page 275).

問題 #602
What does the * (star) property mean in the Bell-LaPadula model?

A. No write up
B. No write down
C. No read down
D. No read up

答案：B

解題說明：
Explanation/Reference:
Explanation:
Three main rules are used and enforced in the Bell-LaPadula model:
The simple security (SS) rule, the *-property (star property) rule, and the strong star property rule. The simple security rule states that a subject at a given security level cannot read data that reside at a higher security level.
The *-property rule (star property rule) states that a subject in a given security level cannot write information to a lower security level. The simple security rule is referred to as the "no read up" rule, and the
*-property rule is referred to as the "no write down"rule.
The third rule, the strong star property rule, states that a subject that has read and write capabilities can only perform those functions at the same security level; nothing higher and nothing lower. So, for a subject to be able to read and write to an object, the clearance and classification must be equal.
Incorrect Answers:
A: The *-property rule is referred to as the "no write down" rule, not the "no write up" rule.
B: The *-property rule is referred to as the "no write down" rule, not the "no read up" rule.
D: The *-property rule is referred to as the "no write down" rule, not the "no read down" rule.
References:
Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, New York, 2013, pp. 369-370

問題 #603
There are some correlations between relational data base terminology
and object-oriented database terminology. Which of the following
relational model terms, respectively, correspond to the object model
terms of class, attribute and instance object?

A. Relation, domain, and column
B. Relation, tuple, and column
C. Relation, column, and tuple
D. Domain, relation, and column

答案：C

解題說明：
Table shows the correspondence between the two models. In comparing the two models, a class is similar to a relation; however, a relation does not have the inheritance property of a class. An attribute in the object model is similar to the column of a relational table. The column has limitations on the data types it can hold while an attribute in the object model can use all data types that are supported by the Java and C++ languages. An instance object in the object model corresponds to a tuple in the relational model. Again

the data structures of the tuple are limited while those of the instance object can use data structures of Java and C++.

問題 #604
Normalizing data within a database includes all of the following except which?

A. Eliminating attributes in a table that are not dependent on the primary key of that table
B. Eliminating repeating groups by putting them into separate tables
C. Eliminating duplicate key fields by putting them into separate tables
D. Eliminating redundant data

答案：C

解題說明：
"Data Normalization
Normalization is an important part of database design that ensures that attributes in a table
depend only on the primary key. This process makes it easier to maintain data and have
consistent reports.
Normalizing data in the database consists of three steps:
1.)Eliminating any repeating groups by putting them into separate tables
2.)Eliminating redundant data (occurring in more than one table)
3.)Eliminating attributes in a table that are not dependent on the primary key of that table"
Pg. 62 Krutz: The CISSP Prep Guide: Gold Edition

問題 #605
......

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