F21CN: Computer Network Security - Broadcast Message Secure Reader - IT Assignment Help

Assignment Task:

Task:

Learning Outcomes
• Practical experience of analysing, designing, implementing and validating solutions to computer network security challenges using common network security tools and formal methods.

• Ability to deal with complex issues and make informed judgements about network security in the absence of com- plete or consistent data.

• Exercise substantial autonomy and initiative in addressing computer network security challenges.
• Showing initiative and team working skills in shared computer network security application development.
• Demonstrate critical reflection on network security issues.
1 Overview
This assessed coursework is for MSc students taking F21CN. It is worth 30% of the overall course mark for Computer Network Security. It is one of two pieces of assessed coursework for this course. This coursework is an exercise in creating, using and revoking X.509 and PGP certificates. It involves developing an application that can be securely be used to read broadcast messages digitally. The ap-plication is capable of reading messages from a set of trusted authors (using PGP certificates). The application is certified by a local Certification Authority (CA). Context of use: the application is to be distributed to the members of an organisation to read messages authored by a selected number of members.

Pair Tasks
Each pair should perform the following tasks:
1. create one self-signed PGP certificates and private keys for each of member of the pair
2. create one self-signed X.509 certificate and private key for the pair
3. create a local CA run by the pair (the local CA should be given a suitable X.500 name and have
a self-signed X.509 certificate created for it; it may be appropriate to take steps to ensure that this certificate has the basic constraint extension set on it to identify it as a CA certificate)
4. form a group with at least one other pair of students and do group activities:

(a) exercise due diligence in using key to sign other pairs’ certificates using your local CA
(b) get your pair’s certificate signed by at least one other pairs’ local CA
5. with the wider group of students hold virtual key party(ies) for members to sign each other’s OpenPGP certificates
6. each member of the pair, encrypt a plaintext message2 with your PGP private key and share with wider group
7. write an application to read messages written by authors of which you were able to sign OpenPGPcertificates
8. sign the application with the private key corresponding to the pair’s X.509 certificate

9. demonstrate your application works correctly using a recorded video3 with screen sharing involv-ing both members of the pair (maximum length: 5 minutes)

10. consider now that one of your pair’s PGP certificate has been compromised as well as your pair’s X.509 certificate and perform the followings:

(a) create a revocation certificate for the compromised PGP key and share the revocation cer-tificate with the wider group

(b) create a certificate revocation list including your pair’s X.509 certificate
(c) once you have received at least one PGP revocation for a public key your application uses,

create a newer version of your application; for this, you will need to issue a new X.509 cer- tificate

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