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NEW QUESTION: 1
Network protocol models are described as layers that---------------
A. permit separation of concerns of lower layers (e.g., hardware) from higher layers (e.g., application)
B. are highly consistent in number and function among different protocols
C. add increasing efficiency to higher layers (e.g., application) than lower layers (e.g., hardware)
D. provide efficient application access to network hardware addresses
Answer: A
NEW QUESTION: 2
Which of the following is an example of least privilege?
A. The operators' duties are frequently rotated.
B. An operator does not know more about the system than the minimum required to do the job.
C. An operator does not have more system rights than the minimum required to do the job.
D. An operator cannot generate and verify transactions alone.
Answer: C
Explanation:
Least Privilege embodies the concept that users or operators should be granted the lowest level of system access or system rights that allows them to perform their job.
*Answer "An operator does not know more about the system than the minimum required to do the job" is need-to-know
*"The operators' duties are frequently rotated" is job rotation
*"An operator cannot generate and verify transactions alone" is separation of duties.
NEW QUESTION: 3
Which of the following items is NOT primarily used to ensure integrity?
A. Hashing Algorithms
B. The Biba Security model
C. Cyclic Redundancy Check (CRC)
D. Redundant Array of Inexpensive Disks (RAID) system
Answer: D
Explanation:
RAID systems are mostly concerned with availability and performance.
All of the following were all concerned with integrity, only RAID was NOT mostly concerned with Integrity:
Cyclic Redundancy Check: A cyclic redundancy check (CRC) is a type of function that takes as input a data stream of unlimited length and produces as output a value of a certain fixed size. The term CRC is often used to denote either the function or the function's output. A CRC can be used in the same way as a checksum to detect accidental alteration of data during transmission or storage. CRCs are popular because they are simple to implement in binary hardware, are easy to analyze mathematically, and are particularly good at detecting common errors caused by noise in transmission channels.
Hashing Algorithms: In cryptography, a cryptographic hash function is a hash function with certain additional security properties to make it suitable for use as a primitive in various information security applications, such as authentication and message integrity. A hash function takes a long string (or 'message') of any length as input and produces a fixed length string as output, sometimes termed a message digest or a digital fingerprint.
Enlarge
Above you see a hash function at work
In various standards and applications, the two most-commonly used hash functions are
MD5 and SHA-1. In 2005, security flaws were identified in both algorithms. Many security professionals have started making use of SHA-256 and SHA-512 which are stronger hashing algorithms.
The Biba Security Model:
The Biba Integrity Model was developed to circumvent a weakness in the Bell-LaPadula computer operating system protection model which did not include the possibility of implicit deletion of security objects by writing to them.
In general, preservation of integrity has three goals:
Prevent data modification by unauthorized parties
Prevent unauthorized data modification by authorized parties
Maintain internal and external consistency (i.e. data reflects the real world)
The Biba model address only the first goal of integrity. The Clark-Wilson model address all
3 goals listed above.
References:
http://www.answers.com/topic/biba-integrity-model
http://www.answers.com/message+digest?cat=technology
http://www.answers.com/topic/hashing?cat=technology
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