Ask Question, Ask an Expert


Ask Computer Network & Security Expert

problem 1:

a)  If m = p•q•r where p, q, and r are prime numbers, what is Φ (m)?

b) Therefore, compute Φ (440).

problem 2: describe the given terms as used in the cryptography:

a) Avalanche effect
b) Stream cipher
c) Primitive root
d) Confusion
e) Steganography

problem 3: Consider an elliptic curve encryption or decryption scheme. The cryptosystem parameters are E5(1,6)  and G = (2,4). B's secret key is nB = 2.

a) Determine B's public key PB.

b) A wishes to encrypt the message Pm = (0, 2) and selects the random value k = 2. Find out the ciphertext Cm.

problem 4:

a) Bob has public RSA key (n = 77, e = 7). Show that Bob’s private key is (d = 43).

b) Alice wants to send the message m = 13 to Bob. She encrypts the message by using Bob’s public key. Find out the value of the ciphertext which Alice sends to Bob?

c) David has as well sent an encrypted message to Bob. The ciphertext value that Bob receives from David is 17. Showing all your working, use Bob’s key to decrypt this ciphertext and recover the value of the David’s message.

problem 5: Consider cryptographic hash functions.

a) What is meant by collision resistance for hash function?

b) What common usage do hash functions have in connection with the digital signatures?

c) What is the difference between a hash function and a MAC (message authentication code)?

d) Why is it proposed to use a hash function with 2n bits of output when it is used as the component in a system designed for n bits of security?

Computer Network & Security, Computer Science

  • Category:- Computer Network & Security
  • Reference No.:- M96479

Have any Question? 

Related Questions in Computer Network & Security

Explain briefly what is meant by lsquooptimising a

Explain briefly what is meant by ‘optimising a network'. Answer should refer to all aspects of optimisation, including resource smoothing /levelling, crashing the network, and anything else you consider relevant.

Assignment overviewpurpose of the assessmentthe purpose of

Assignment Overview Purpose of the assessment: The purpose of this assignment is to develop skills to identify appropriate network security tools for various operating systems. Students will also have opportunity to expl ...

Assignment big switch network designbig switch is a

Assignment: Big Switch Network Design Big Switch is a medium-sized sales organization with 100 employees with annual revenue of $10 million. Big Switch has a central office of 30 employees that supports a sales force con ...

1overviewthe learning objective of this assignment is for

1 Overview The learning objective of this assignment is for students to get familiar with the concepts in the security techniques such as symmetric and asymmetric encryption, hashing and certificates in Public Key Infras ...

Task sheettask scenarioan information security management

Task Sheet TASK SCENARIO: An information security management system (ISMS) represents a systematic approach to designing, implementing, maintaining, and auditing an organization's information system security objectives. ...

Corporate profile cybersecurity risk profilefor this paper

Corporate Profile: Cybersecurity Risk Profile For this paper, you will construct a cybersecurityrisk profile for the company that you wrote about in Part 1 of the Corporate Profile project. Your risk profile, which inclu ...

Context this assignment involves preparation of a report

Context This assignment involves PREPARATION OF A REPORT. The report relates to the Scenario given below. Aim: You have been asked to present a proposal for an Internet/Intranet solution for a college. The college is esp ...

The following ciphertext has been obtained by vigenere

The following ciphertext has been obtained by Vigenere encryption. ocwyikoooniwugpmxwktzdwgtssayjzwyemdlbnqaaavsuwdvbrflauplooubfgq hgcscmgzlatoedcsdeidpbhtmuovpiekifpimfnoamvlpqfxejsmxmpgkccaykwfz pyuavtelwhrhmwkbbvgtgu ...

Assignment a complete home networkdevelop an entire home

Assignment: A Complete Home Network Develop an entire home network with a budget of $5,000.00. Your configuration must assume the purchase of associated hardware for access to both wireless and wired connections and a br ...

The project requires a significant amount of work on

The project requires a significant amount of work on research, design and implementation. It is advised that you should start the project as soon as possible. A Simple File Transfer Protocol Design and implement a simple ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

A cola-dispensing machine is set to dispense 9 ounces of

A cola-dispensing machine is set to dispense 9 ounces of cola per cup, with a standard deviation of 1.0 ounce. The manuf

What is marketingbullwhat is marketing think back to your

What is Marketing? • "What is marketing"? Think back to your impressions before you started this class versus how you

Question -your client david smith runs a small it

QUESTION - Your client, David Smith runs a small IT consulting business specialising in computer software and techno

Inspection of a random sample of 22 aircraft showed that 15

Inspection of a random sample of 22 aircraft showed that 15 needed repairs to fix a wiring problem that might compromise

Effective hrmquestionhow can an effective hrm system help

Effective HRM Question How can an effective HRM system help facilitate the achievement of an organization's strate