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Question1. Assume we want to use Kerberos for securing electronic mail. The obvious way of accomplishing this is for Alice, when sending a message to Bob, to obtain a ticket for Bob and include that in the email message, and to encrypt and/or integrity-protect the email message using the key in the ticket. The problem with this is that then the KDC would give Alice a quantity encrypted with Bob's password-derived master key, and then Alice could do off-line password guessing. How might Kerberos be extended to secure email without allowing off-line password guessing?(Hint: Issue human users an extra, unguessable master key for use with mail, and extend the Kerberos protocol to allow Bob to safely obtain his unguessable master key from the KDC.)
Question2. Suppose we are using secret key technology. What is wrong with the following source authentication scheme?Alice chooses a per-message secret key K, and puts an encrypted version of K in the header for each recipient, (ie Bob and Ted). Next, Alice uses K to compute a MAC on the message, say a DES-CBC residue, or to compute a message digest of K and append it to the message.
(Hint: this works fine for a single recipient, but there is a security problem if Alice sends a multiple-recipient message. Once they receive the message, Bob and Ted know both K and K encrypted with the key they share with Alice. This allows either to forge a message to the other as if it were from Alice.)
Discuss the objectives of database management systems, Integrating databases; sharing information; maintaining integrity; reducing redundancy and enabling database evolution
Simulate the long-term scheduler, the short-term scheduler and the I/O scheduler of the computer using the First-Come-First-Serve algorithm.
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The software house has been contacted by a Governmental Nuclear Reactor Agency that wants to change the current Operating System of their plant.
White Hat Cracking engage security testing by arrangement. Grey Hat Cracking seeks to identify insecure systems and inform administrators or users of vulnerabilities.
In recent computer trend sources, it has been discussed that the OS are likely to become more user friendly, voice driven, stable, and even will repair themselves when required.
Explain the techniques that will be used to monitor implementation of the electronic medical record.
the wife calls deposit (). Describe how a race condition is possible and what might be done to prevent the race condition from occurring.
Discuss the benefits of networked computers? What are the drawbacks? Describe similar characteristics between the internet and a group of networked computers.
In different communications models, communication may take place using either "message passing" or "shared memory". Distinguish between "message passing" and "shared memory", illustrating your answer with a diagram Give three advantages of virt..
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