ciphertext, Encode the following plaintext, using the Caesar cipher: LORD, Computer Network Security

ciphertext, Computer Network Security

Assignment Help:

Encode the following plaintext, using the Caesar cipher:

LORD OF THE RINGS
b) The following ciphertext

jw njbh lxmn cx kanjt

has been encoded using a generalised Caesar cipher where the following rule computes a character ci in the cipher text from a character pi in the plain text:

ci = E(pi) = pi + d

where d is a positive integer.

Find the number d and the plain text. Hint: use a table of English letter frequencies. This information can be found on the Internet.

c) Now consider the following cipher text:

homlox prv hetorx orxolxpersorx

A more general substitution cipher has been used. Recall that this means that every letter of the alphabet appearing in the plain text is replaced with another unique letter of the alphabet. For example, the letter ''a'' could be mapped into ''h'', the letter ''b'' into ''x'' etc. The ciphertext then simply consists of these mapped letters.
Work out the original plain text message, using the following approach:

(i) Write a line of dashes ("_") as placeholders for the plaintext characters corresponding to each letter in the above cipher text. Make sure you also mark the spaces between the different words as they will give you clues as soon as you know some of the letters.

(ii) Using the English letter frequency table, find the letter which the letter "e" is most likely to be replaced with. Use this to replace some of the "_" by the letter "e" (simply copy the last line you wrote and then replace).

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages

ciphertext, Computer Network Security

Related Discussions:- ciphertext

Explain the dimension of service quality, Problem 1: Discuss how TWO of...

Compare and contrast data encryption standard, Problem (a) Using Vigen...

Complexity of network systems, Computer networks is a complex subject due t...

Architecture of www named world wide web, Write down short notes on the arc...

ISDN, Explain the architecture of ISDN.....?

Arp message format, ARP MESSAGE FORMAT Although the ARP data packet fo...

Computer network and internet, WHICH OF THE PRODUCT OF llc sublayer

Algorithm, algorithm on simple intrest

Structure of a typical frame relay, Problem a) Consider a 1000 Mbps Eth...

Explain the concept of zero knowledge proofs, (a) Describe the concept of ...

Write Your Message!

Featured Services

Online Tutoring

Project Development

Exam Preparation

Course Help

Assignment Help

Popular Subjects

Assured A++ Grade

Academics

Major Subjects

Majors

Get In Touch

TERMS & POLICIES

HELP & SUPPORT