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Please note that in these examples, we make a lot of assumptions that may not fit your reality. Please plug your own numbers into the formulas to develop models that fit your implementation. Two implicit assumptions in our examples are that hardware failures will be repaired quickly and that they can be repaired in clustered configurations without stopping services. By making repairs in a timely manner, you can ensure that if a second component fails, your system will be able to survive. By replacing or repairing failed components quickly, you will significantly reduce the likelihood that a second failure will occur and cause more extended

1) What are the differences between message secrecy and message integrity Can you have one without the other Justify your answer 2) What is the difference between an active and a passive intruder 3) What is an important difference between a symmetric key system and a public key system 4) Suppose that an intruder has an encrypted message as well as the decrypted version of that message Can the intruder mount a cipher-text only attack, a known-plaintext or a chosen-plaintext attack 5) Suppose N people want to communicate with each of the N-1 other people using symmetric key encryption All communication between any to people, i and j, is visible to all other people, and no other person should be able to decode their communication How many keys are required in the system as a whole Now suppose that public key encryption is used How many keys are required in this case 6) What is the purpose of a nonce in an authentication protocol 7) What does it mean to say that a nonce is a once-in-a-lifetime value In whose lifetime 8) What is the man-in-the-middle attack Can this attack occur when symmetric keys are used 9) What does it mean for a signed document to be verifiable, non-forgible, and non-repudiable 10) In what way does a message digest provide a better message integrity check than a checksum such as the Internet checksum 11) In what way does a message digest provide a "better" digital signature than using a public key digital signature 12) Is the message associated with a message digested encrypted Since either "yes" or "no" are acceptable answers here, you should explain your answer 13) What is a key distribution center What is a certification authority 14) Summarize the key differences in the services provided by the Authentication Header protocol and.

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The ActiveX approach relies on digital signatures, a kind of encryption technology in which arbitrary binary files can be "signed" by a developer, distributor, or certifier Because a digital signature has special mathematical properties, it is very difficult to forge That means a program like your browser can verify a signature, allowing you to be fairly certain who vouched for a piece of code (as long as people are carefully guarding and managing the private keys used to sign code) To make things easy, you can instruct your browser always to accept code signed by some party that you trust, or always to reject code signed by some party that you don't trust The signature also supplies data integrity, meaning it can ensure that the code you received is the same as the code that was originally signed Signed code cannot be easily hijacked and modified into a Trojan Horse.

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downtime. The quicker you can make the repair, the higher the level of service you will be able to provide. If it becomes necessary to shut down systems or services to replace hardware a disk on a shared SCSI bus, for example then our estimates of downtime in cluster configurations will be low. If you have a two-node cluster sharing SCSI disks, and a disk needs to be replaced, it will be necessary in most cases to shut down both systems while making the repair. When fiber connections are employed, disks and systems can usually be removed without affecting other systems on the same cabling.

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The ActiveX system provides a black-and-white trust model: Either you trust the code completely and allow it to run unhampered on your machine, or you don't That means trusting the wrong sort of code just once is all it takes Once an attack control runs on your system, it can rewrite your security policy in such a way that all future attacks will work Of course, it can do anything at all, so this is only one of zillions of attack scenarios Serious attacks using ActiveX have been seen in the wild (although their use is not.

A large restaurant supply company has a file server that has a logical volume manager (LVM) and enhanced filesystem product running on it. They are considering adding a second, identical server and clustering the two servers together using a standard commercial clustering software product. The expected life span of the system is 5 years, and the cost of downtime is $75 per minute or $4,500 per hour. To implement this cluster, several actions and purchases are required. The company must do the following:

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