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Define the terms class, object and message. How does the concept of message passing help to encapsulate the implementation of an object, including its data? List all of FoodCo's products that are described in the case study material in chapter B1. Arrange these into a hierarchy. Imagine some other products that make your hierarchy more interesting and add them to your description. If these were classes in an object model and were part of an inheritance hierarchy, would your resulting hierarchy comply with the Liskov Substitution Principle? If the resulting hierarchy would comply, explain some potential benefits of structuring classes into an inheritance hierarchy in this way. If the resulting hierarchy does not comply, explain some potential problems that may arise in future development of the model.
If IPSec provides security at the network layer, why is it that security mechanisms are still needed at layers above IP
How has honeypots been used in the field of national security?
1. The essence of a digital signature is that it ensures authentication. Explain how and why it does that.
In a public-key system using RSA, you intercept the ciphertext C = 13 sent to a user whose public key is e = 23, n = 143. What is the plaintext M?
Why are timestamps used in the Kerberos protocol - When Alice is on a trip, she tries to store an important message in the CEO's account directory.
Hures is a leading human resource service provider. To keep up with growing business demands,it implemented its first information system in 1987 purchasing a main frame computer that servedso-called dumb terminals on the users' desktops.
If this message is sent unencrypted and successfully received, determine its entropy? If this message is encrypted with DES using random 56-bit key, determine the encrypted message's entropy?
Complete a research essay about information security. The research provides you with the opportunity to complete research and demonstrate knowledge of information security from a theoretical perspective
A 1,024-bit message is used to generate a 24-bit hash. On the average, how many other messages could be expected to generate the same hash value? What is the probability that two massages that generate the same 24-bit hash?
A 1,048,576-bit message is used to generate 10-bit hash. One average, how many other messages could be expected to generate same hash value?
Explain different ways that this program can be sabotaged so that during execution it computes a different sum, for example, 3 to 20.
Computer security is integral part of any organization, if any organization hasstarted working in, immediately it should start Computer security for its systemif they want to protect their system for future.
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