Compare and contrast data encryption standard, Computer Network Security

Assignment Help:

Problem

(a) Using Vigenère cipher and given the key abc, find the ciphertext for the message:

simplicity

Only the 26 lower-case alphabetical characters are used in messages.

(b) Compare and contrast Data Encryption Standard (DES) with Advanced Encryption Standard (AES) with respect to:

(i) their classification
(ii) their encryption/decryption structure and algorithm
(iii) their cryptographic strength
(iv) types of attacks
(v) hardware/software implementation

(c) Consider a Diffie-Hellman scheme with a common prime q = 11 and a primitive root α = 2.

(i) If user A has public key YA = 9, what is A's private key XA?
(ii) If user B has public key YB = 3, what is the shared secret key K, shared with A?

(d) What are the characteristics of the ‘one-time pad' cryptosystem as compared to Vigenère Cipher.

Give one advantage and two problems with one-time pad cryptosystems.

(e) S/MIME (Secure / Multipurpose Internet Mail Extensions) is a standard for public key encryption and signing of e-mail encapsulated in MIME. What are the cryptographic security services for electronic messaging applications provided by S/MIME?


Related Discussions:- Compare and contrast data encryption standard

Explain the terms used in network security, Question 1 (a) Explain b...

Question 1 (a) Explain briefly the following terms as used in network security: (i) Denial of service (DoS) attack (ii) Birthday attack (iii) DeMilitarized Zone

Bus topology, BUS TOPOLOGY In a bus topology all devices are attached ...

BUS TOPOLOGY In a bus topology all devices are attached to a single long cable and any device can send data to any other device. For this function, coordination is needed to d

Systems development life cycle (sdlc)-information security, SDLC Systems ...

SDLC Systems development life cycle (SDLC) is process of developing information systems through analysis, design, investigation, implementation and maintenance. SDLC is called as

Increasingly significant impact on society, Question: (a) African gove...

Question: (a) African governments are slowly shifting to more transparent ICT regulations. However, but limited spectrum availability remains a key barrier to sustaining lon

Cyber security - vulnerabilities, The world has to deal with newly released...

The world has to deal with newly released vulnerabilities on a daily basis.  These vulnerabilities eventually lead to active exploits of systems, and it is our job as cyber securit

Explain the limitations of a firewall, Question: (a) Mention three lim...

Question: (a) Mention three limitations of a firewall. (b) Compare packet-filtering and proxy-base firewalls. Give advantages and drawbacks of both. (c) "Proxies eff

Calculate the total latency, Question (a) Inspect the following ifconfi...

Question (a) Inspect the following ifconfig output of an IPv6 interface: i. What is the hidden Hardware Address of the interface on Line #1? ii. What is the hidden subn

Hypothetical reliable data transfer protocol, Hypothetical reliable data tr...

Hypothetical reliable data transfer protocol: A jumping window based Go-back-N  ARQ protocol for file transfer using UDP as the transport protocol: In this protocol, a window o

Biology, Ask question #Minimum 100 words are there non parasitic v...

Ask question #Minimum 100 words are there non parasitic viruses

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd