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1) Using the monoalphabetic cipher in Figure 7-3 Encode the message "This is an easy problem" Decode the message "rmij'u uamu xyj" 2) Show that Eve's known plaintext attack in which she knows the (ciphertext, plaintext) translation pairs for seven letters reduces the number of possible substitutions to be checked by approximately 109 3) Consider the Vigenere system shown in Figure 7-4 Will a chosen plaintext attack that is able to get the plaintext encoding of the message, "The quick fox jumps over the lazy brown dog" be sufficient to decode all messages Why 4) Using RSA, choose p = 3 and q = 11, and encode the phrase "hello" Apply the decryption algorithm, to the encrypted version to recover the original plaintext message 5) In the man-in-the-middle attack in Figure 73-7, Alice has not authenticated Bob If Alice were to require Bob to authenticate himself using ap50, would the man-in-the-middle attack be avoided Explain your reasoning 6) The Internet BGP routing protocol uses the MD5 message digest rather than public key encryption to sign BGP messages Why do you think MD5 was chosen over public key encryption 7) Compute a third message, different than the two messages in Figure 74-5, that has the same checksum as the messages in Figure 74-5 8) Augment the KDC protocol shown in Figure 75-1 to include the necessary authentication messages Be sure to show the use of nonces and indicate which key values are used to encrypt which messages 9) In the protocol and discussion of Figure 75-1, why doesn't Alice have to explicitly authenticate Bob 10) In the protocol in Figure 75-2, Alice did not include her own identity in the message to the CA Anyone could thus spoof a message from Alice to the CA Does this compromise the integrity of the CA's public key distribution Justify your answer 11) Why is there no explicit authentication in the protocol in Figure 75-2 Is authentication needed Why 12) Consider the KDC and the CA servers Suppose a KDC goes down What is the impact on the ability of parties to communicate securely, ie, who can, and can not, communicate Justify your.

Purchase a second server. Install the logical volume manager (LVM) software and filesystem on the new server. Install the clustering software on both nodes. Implement a pair of heartbeat networks between the nodes. Configure the option in the clustering software to enable automatic switchover to a standby network card. This option will protect them from the failure of a NIC by moving the IP addresses associated with that NIC to dedicated standby NIC in the same node, without requiring a system-to-system failover. The hardware requirements for these additional networks is four NICs, two per node.

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widespread). For an explanation of these attacks and more on ActiveX insecurity, see Anup Ghosh's book E-Commerce Security: Weak Links, Best Defenses [Ghosh, 1998].

For more detailed information about clustering and failover, please see 15, Local Clustering and Failover. Estimated costs of implementation:

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1) Suppose that an intruder could both insert and remove DNS messages into the network Give three scenarios showing the problems that such an intruder could cause 2) No one has formally "proven" that 3-DES or RSA are "secure" Given this, what evidence do we have they are indeed secure 3) If IPsec provides security at the network layer, why is it that security mechanisms are still needed at layers above IP 4) Go to the International PGP homepage (http://wwwpgpiorg/) What version of pgp are you legally allowed to download, given the country you are in

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Second server: $42,000 Two licenses and media for clustering software: $12,100 Extra NICs and cables: $4,500

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