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Suppose that Eve runs a key server. Alice downloads a key from the key server which Eve claims is Bob's public key. Bob downloads a key from the key server which Eve claims is Alice's public key.
a. Given that Alice and Bob both assume that they have the correct public keys for the other party, and assuming that Eve can intercept any messages passed between Alice and Bob, is there any way that Eve can read the encrypted communications between the two parties? If so, how could she do it, and would Bob or Alice know that Eve was reading their messages?
b. What steps could Alice take to ensure that the public key which Eve claims belongs to Bob is actually correct?
Bob is concerned about the possibility of having his 100k byte file modified without his knowledge, so he calculates a 100 byte hash. Alice, unbeknownst to Bob, changes a single character in Bob's file.
Assume that eight more characters were added to the password and that the DES algorithm was changed so as to use all 16 password characters. What would be the expected time to find all users' passwords using a dictionary attack?
Since physical security is often managed under separate responsibility from information security, risk analysis for information security does not need to address physical security.
What is your understanding of the difference between a stream cipher and a block cipher?
Identifying and explaining how the breach occurred and identifying and discussing known or suspected losses of confidentiality, integrity, and availability for information and/or information systems
Generates the alternative message which has a hash value which collides with Bob's original hash value. Illustrate a message that Alice may have spoofed, and demonstrate that its hash value collides with Bob's original hash.
Suppose that Alice shares secret with her company's server computer. When Alice is on trip, she tries to store important message in CEO's account directory. Is this protocol secure? If not, how do you feel it could be modified to make it so?
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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?
Network Security
Discuss why are many of the reliable, effective biometric systems perceived as intrusive by users and what are stateful inspection firewalls and how do the tables track the state and context of each exchanged packet?
What factors might an organization consider when choosing to implement an AD-integrated DNS zone versus a traditional zone? Describe a scenario in which it would be preferable
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