authentication protocol

Suppose we are using a three-message mutual authentication protocol, and Alice initiates contact with Bob. Suppose we wish Bob to be a stateless server, and therefore it is inconvenient to require him to remember the challenge he sent to Alice. Let's modify the exchange so that Alice sends the challenge back to Bob, along with the encrypted challenge. The protocol is: (It is shown in the image attached) Is this protocol secure? Justify your answer

Cost Proposal

Background: NorthWestern Loan (NWL) is requesting a proposal for the installation of a local area networki at its loan office. NWL has purchased a new software package for loan administration and would like to replace its existing PCs and network cabling. The current network uses an old version of Novell and coaxial cable. The software vendor for the new system has told NWL that these cables might need to be replaced. The new system includes the following: - Software package and sever. The server is a Pentium 750, has 256M RAM, and runs Microsoft Windows 98. - Eleven client computers that will need to be connected to the server. These clients are all running Microsoft Windo... click for more

Network & Computer Security

References: http://www.sans.org/top20/ Background: Assume you are the network manager with several servers and over 500 client PCs. All computers are connected to the Internet via routers that you control. Read over the top 20 list at the above reference website. Problem: Answer the following questions: Are you qualified to address all of these issues in your organization? What are your thoughts about the needs of organizations for a security specialist given the type of information you see here? Do you need highly skilled people in your organization? Does it appear that this might be a very time consuming problem with the number of computers and users you have in this... click for more

Network & Computer Security II

Background: See attached document. Problem: Once you have addressed and repaired all the issues referenced in the background, what steps should you take to continually address these and newer threats and how will you, as network manager, discover and learn about the new threats that exist?

Network & Computer Security III

Introduction: In Many development organizations and universities network managers must oversee a network that has many computers connected to it that are used by developers for design and product development purposes. Often, these developers are using systems or settings for which the network managers have little or no expertise (such as Linux or Unix when the managers run Microsoft only operating systems). While the manager needs to maintain security, the developers need to be able to experiment and implement new systems without a lot of bureaucratic headaches. Problem: What ideas do you have about how this needs to be handled?