Security goals confidentiality- integrity- digital signature, Computer Networking

Question 1  This question concerns the main security goals (confidentiality, integrity, availability). Describe a situation which provides the goal of confidentiality but does not provide integrity.

Question 2  In a particular form of two-factor authentication, a user shows their identity by providing a password and also by providing the current value displayed on a security token. Describe an attack that would be prevented by this two-factor approach, but which would succeed against a system where identification is based just on passwords.

Question 3  A typical password is about 8 characters long (and so can be stored in 8 bytes, or 64 bits). However, a typical key for encryption/decryption is much longer, and a key of 64 bits would not be considered secure. Explain this in terms of the difference between the way a secret is used as a password, and the way it is used as a key. Hint: what happens if an attacker takes a few months to discover the secret?

Question 4  Suppose that Fred Foolish, a colleague of yours, says "I have heard that the security of an operating system is built on the hardware mechanism that separates user mode from kernel mode. This means that an attack that succeeds against one operating system must have broken the hardware mechanism, and therefore the same attack will work against any other operating system on the same type of machine. Thus there can't be any reason to believe that one operating system is more secure than any other." Write a discussion that explains to Fred why his argument is invalid.

Question 5 What are the necessary properties of a digital signature? List the encryptions that would be applied to a block of plaintext to produce a digital signature of that plaintext. For each encryption state whether the encryption is symmetric or asymmetric and, if asymmetric under whose (sender's or receiver's) public or private key the encryption is performed.

 

Posted Date: 2/16/2013 6:07:23 AM | Location : United States







Related Discussions:- Security goals confidentiality- integrity- digital signature, Assignment Help, Ask Question on Security goals confidentiality- integrity- digital signature, Get Answer, Expert's Help, Security goals confidentiality- integrity- digital signature Discussions

Write discussion on Security goals confidentiality- integrity- digital signature
Your posts are moderated
Related Questions
Explain Bus Topology. The physical Bus topology is the easiest and most widely used of the network designs. It having of one continuous length of cable (trunk) and a terminatin


Network Criteria - Performance - It is able to be measured by transit time and response time. Affected by type of medium, number of users and connected HW/SW - Reliability

Quetion: A 22 nF capacitor is initially charged to 10V. It is then discharged by connecting a 100kW resistor across it. Approximately how long does it take for the voltage on t

Explain the working of Transceivers Transceivers are used to connect nodes to the several Ethernet media. Most computers and network interface cards having a built-in 10BaseT o


Consider an RTP session consisting of five users, all of which are sending and receiving RTP packets into the same multicast address. Each user sends video at 200kbps. a)  What


Question 1 Describe the following a. Internet Technologies b. Networks c. Media Access Control Question 2 Explain the various classes of networks Question 3 Describe various m

State the Example of security audit as case study Linda narrates one of her experience about a security audit. She was performing a spot audit where she was checking certain