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CIS4017-N Systems Administration and Security Assignment

Assignment Title: Cryptography basics, security analysis, design and implementation

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Section A - Cryptography basics

1. RSA

A. Assume a public key for RSA encryption given by the pair (143,11). Find the private key corresponding to this pair.

B. Using the pair (143, 11), decode the encrypted message (111 4 88 57 116 67) assuming the letters were represented by ASCII values (recall that the ASCII values are 65->A, 66->B, ... and 97->a, 98->b, ...)

2. Feige-Fiat-Shamir scheme

C. Describe in detail the simplified Feige-Fiat-Shamir accreditation scheme between Peggy and Victor?

Answer: The simplified Feige-Fiat-Shamir accreditation scheme involves three main steps: commitment, challenge, and response. Firstly, Peggy commits to a value by generating a random value and calculating a commitment based on this value and a public key. She sends this commitment to Victor. Secondly, Victor sends a random challenge to Peggy, asking her to reveal either the original value or the random value used in the commitment. Finally, Peggy responds by revealing the requested value and proving that her response is consistent with the commitment. If the proof is valid, Victor is convinced of Peggy's identity or knowledge of the secret value. This scheme relies on the difficulty of reversing the commitment function, ensuring that Peggy cannot cheat by revealing a different value after receiving the challenge.

D. Consider the simplified Feige-Fiat-Shamir scheme with parameters n=15 and r=11. Trace with these values the contents of all the messages that Peggy and Victor will send/receive.

Answer: The Diffie-Hellman protocol for three parties, Alice, Bob, and Carol, involves the following steps:
1. Public parameters: A large prime number p and a generator g of the multiplicative group modulo p are agreed upon publicly.
2. Key generation: Alice, Bob, and Carol each choose a secret random number, a, b, and c, respectively.
3. Exchange: Alice calculates g^a and sends it to Bob and Carol. Bob calculates g^b and sends it to Alice and Carol. Carol calculates g^c and sends it to Alice and Bob.
4. Shared key calculation: Alice calculates (g^b)^a = g^(ab), Bob calculates (g^a)^b = g^(ab), and Carol calculates (g^a)^c = g^(ac) and (g^b)^c = g^(bc).
5. Shared secret: Alice and Bob share the secret key g^(ab). Bob and Carol share the secret key g^(bc). Alice and Carol share the secret key g^(ac).
Note that the three shared keys are different, ensuring that each pair of parties has a unique secret key for communication.

3. Diffie-Hellman protocol

E. Describe in detail the Diffie-Hellman protocol for three parties Alice, Bob and Carol.

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Section B - Security analysis and design

Scenario 1 - Security models

ABC Ltd. is a company providing security solutions to public services. You are asked to help the ABC Ltd to design a security model for the national defence department - a part of an e-government project on secure information control in managing troops. Assume the armed forces be classified as: {army, navy, air force, marines}, the security levels are typed as: {high, low}.

Your tasks: You should produce a short report (around 500 words) to formalise a Bell Lapadula model to address the confidentiality properties for the specified scenario, and to discuss the strength and weakness of your model.

Hint: You need to describe the model (specify subjects, objects, possible operations - which can be flexible, design your own but need to show your understanding of specifying and applying the BLP model in a real case), the security lattice (a graph can be helpful), the policy and the security properties for the given scenario above.

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Scenario 2 - Security Analysis and Solutions to Conference Management Systems

A conference manage system is a web-based management system which allows researchers submit research papers, the program committee (PC) members (reviewers) to browse papers and contribute reviews, scores and discussion, and release decisions (such as rejection or accept) via the Web. In one arrangement, the conference chair downloads and hosts the appropriate server software.

The system allows users to submit papers, enter reviews & scores and access reviews & scores associated with events (conferences or workshops) regarding to the role of the uses. A user is granted access to the system by providing a role (chair, reviewer, or author) along with a user-id and associated password. Permissible roles for each user are specified at the time a new event is added to the management system. Reviews & scores on papers are initially assigned by chairs (chairs assign papers to reviewers for reviewing, one reviewers can be assigned multiple papers, one paper can be allocated to multiple reviewers). Reviewing are done by reviewers. And a chair can perform any and/or all of these actions, but a chair's updates can only be changed by the chair. An author, in addition to learning about his or her reviews & grades on individual papers, is entitled to learn the acceptance statistics (but not other papers' reviews), and the conference program.

Threat model: The adversary is a user who desires to learn the reviews & scores, changes reviews & scores, or prevent others from learning or changing reviews & scores. The adversary has access to the management system and also can read, delete, and/or update network messages in transit. The adversary cannot physically access or run programs on a user's machine that is running a browser to access the management system. And the adversary cannot physically access or run programs on the server hosting the management system.

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Your tasks: You are asked to produce a report (1500-2000words) to provide contemplate descriptions of the above Web-based Conference Management System and identify the following:

A. Assets and security properties: what objects should be protected, what security properties might we expect the system to enforce? For each such security property, label it with one of: confidentiality, integrity, or availability?

B. Vulnerability: explain the vulnerability in the system and use an attack tree/model to describe how an attack could be mounted. Restrict your consideration to the threat model provided.

C. Protection: explain what cost-effective protections are available against the threats that you identify. Remember the focus is on software vulnerabilities.

Hint: Assuming that the manager is not a technical person, craft your explanation in a way that can be explained to a layman and include figures where necessary.

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Scenario 3 - Design and Implementation of a Secure Server Network

This task involves designing and implementing an Internet-connected secure server network for a medium sized company named Smith Logistics, UK. They want to implement a secure network that uses Class C network address with two subnets in total - server subnet and one LAN subnet and has approached you. They have asked you for a price quote as well. But they want to see a virtual machine implementation and simulation results before they commit to purchase anything.

You can use Virtual Machines for the implementation and the security attacks. The server network should consist of one server, i.e. Windows2008/2012 or Linux (Ubuntu or others).

It should be connected to one workstation (at the least), i.e. Windows Server to Windows client or Linux Server to Linux client. The workstation denotes a different LAN.

Your tasks: You should write a report with the appropriate details (2500 words max, but flexible) documenting all that you have done including how the servers are setup, how they are tested and how the attacks are done to them along with countermeasures. Use the tasks below as a guideline to write.

A. Using the Virtual Machines, configure ANYONE server namely Windows2008/2012 or Ubuntu(or other Linux servers), with the following: (i) DNS server (ii) DHCP server (iii) web server. Use a client computer to test the three servers to see if it works properly. Capture the appropriate screen shots or illustrate that through commands and output screens. Draw a simple network or workflow diagram of your network.

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Hints:

i. DNS Server: Show that the smithlogistics.com (or similar) domain name is configured and that the clients could join it. Create some users and login in to the domain. Test what was implemented.

ii. DHCP Server: Show the dynamic IP address assignment with an address pool along with evidence of clients receiving dynamic IP.

iii. Web server: Configure IIS and Apache with web address www.smithlogistics.com (or similar) can be accessed from the web client. Test the web server with a sample webpage being accessed from the client. Install an SSL certificate to make it secure.

B. Implement at least four security attacks on the servers through Kali Linux or other independent tools and suggest countermeasures to stop them. Illustrate the attacks through commands or using GUI tools. Capture the attacks through screen shots or graphs or tables.

C. Show the detailed cost of implementing your solution, in a table format. You can try to show two different costs for the company to choose from. Hints: Research on the costs of servers (hardware and software), switches, workstations, cables, etc.

D. Show all references used in the report, using appropriate referencing. Hints: Harvard referencing can be used and make sure the format is fully followed.

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