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Why are timestamps used in the Kerberos protocol? Assume that Alice shares a secret s with her company's server computer. When Alice is on a trip, she tries to store an important message in the CEO's account directory. This message needn't be encrypted since confidentiality is not important here, but the CEO needs to be guaranteed that the message really is from someone who knows the secret s (e.g. Alice) when the CEO opens his/her computer the next day. A naïve protocol to achieve this may look like this: Alice-->Server: "This is Alice, I have an important message to forward to the CEO" Server-->Alice: "OK, please encrypt R" (where R is a random nonce) Alice-->Server: "Es(R)" (that is, R is encrypted with the secret s) Server-->Alice: "Please send the message" Alice-->Server: "The CEO needs to attend a meeting in Liverpool on May 1, 2006" The server stores this message in the CEO's directory Is this protocol secure? If not, how do you feel it could be modified to make it so?
Answer the following in relation to a scenario where Bob and Alice use Kerberos for mutual authentication. When Bob receives a ticket from Alice, how does he know it is genuine?
Research current security trends, countermeasures, and threats. What will be the most threatening security issues firms have to deal with within the next five years?
Write a 1-2 page document that describes the options for improving the FTP environment described. Make a recommendation for a single solution for the FTP environment.
Sunnyville Corporation is in the business of selling home appliances. Sunnyville Corporation has over 50 sales agents across the country. The management at Sunnyville Corporation has decided to implement an online sales program.
Assume your corporation is trying to decide whether it should buy special equipment to prepare some of its high-quality publications itself or lease the equipment from another corporation.
Assume that evil Charlie eavesdropped on Bob's message to server. How can he with the help of his equally evil buddy Don, extract key K that Alice and Bob are using to protect their communications?
For the network that you have chosen to characterize, list the MAC Address, IP Address, IP Subnet Mask, Gateway Information. Based on this information, explain the flow of information in and configuration of this network.
Business Continuity (BC) planning and Disaster Recovery (DR) planning are main elements in organizational security architectures. Write down the difference between them.
Consider the plain (i.e., non-padded) RSA public-key encryption scheme. Encrypt the message m = 12 using the public key pk = (N,e), where N = 35 and e = 3.
What special consequences do you foresee from information security breaches confined to online retail banking compared to online commercial banking?
What security features could be given without changing mail delivery infrastructure, i.e., by only running special software at source and destination?
Show that a passive eavesdropper that observes a single execution of the protocol can recover key s and impersonate the tag.
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