Data Structures and Algorithms in Java
6th Edition
ISBN: 9781118771334
Author: Michael T. Goodrich
Publisher: WILEY
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Textbook Question
Chapter 3, Problem 39P
Write a program that can perform the Caesar cipher for English messages that include both upper- and lowercase characters.
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Encrypt
Caesar cipher is a kind of substitution cipher. Instead of using a substitution table, the alphabets are rotated by a number (a key). For example, if the key is 3, plaintext alphabet a would become d, and plaintext alphabet z would become c.
Write a program that implements the Caesar Cipher. You program will first prompt for the key and then for the mode (E for encryption and D for decryption) and finally for the message to be encrypted / decrypted. Your program will then output the encryption / decryption message.
For this question, the input message may consists of any character, the program should encrypt or small letter case a to z only. All other characters should be kept intact after encryption or decryption.
Python
The Dan Cipher works like this: shift the first lowercase character to the right by 1, the second lowercase character to the right by 2, and so on. Characters that are not lowercase characters are not changed.
Write a program that takes a string and prints the result of applying the Dan Cipher.
A simple and very old method of sending secret messages is the substitution cipher.
You might have used this cipher with your friends when you were a kid.
Basically, each letter of the alphabet gets replaced by another letter of the alphabet.
For example, every 'a' get replaced with an 'X', and every 'b' gets replaced with a 'Z', etc.
Write a program thats ask a user to enter a secret message.
Encrypt this message using the substitution cipher and display the encrypted message.
Then decryped the encrypted message back to the original message.
You may use the 2 strings below for your subsitition.
For example, to encrypt you can replace the character at position n in alphabet
with the character at position n in key.
To decrypt you can replace the character at position n in key
with the character at position n in alphabet.
Have fun! And make the cipher stronger if you wish!
Currently the cipher only substitutes letters - you could easily add digits, puncuation, whitespace and so
forth.…
Chapter 3 Solutions
Data Structures and Algorithms in Java
Ch. 3 - Prob. 1RCh. 3 - Write a Java method that repeatedly selects and...Ch. 3 - Prob. 3RCh. 3 - The TicTacToe class of Code Fragments 3.9 and 3.10...Ch. 3 - Prob. 5RCh. 3 - Prob. 6RCh. 3 - Prob. 7RCh. 3 - Prob. 8RCh. 3 - Prob. 9RCh. 3 - Prob. 10R
Ch. 3 - Prob. 11RCh. 3 - Prob. 12RCh. 3 - Prob. 13RCh. 3 - Prob. 14RCh. 3 - Prob. 15RCh. 3 - Prob. 16RCh. 3 - Prob. 17CCh. 3 - Prob. 18CCh. 3 - Prob. 19CCh. 3 - Give examples of values for a and b in the...Ch. 3 - Suppose you are given an array, A, containing 100...Ch. 3 - Write a method, shuffle(A), that rearranges the...Ch. 3 - Suppose you are designing a multiplayer game that...Ch. 3 - Write a Java method that takes two...Ch. 3 - Prob. 25CCh. 3 - Prob. 26CCh. 3 - Prob. 27CCh. 3 - Prob. 28CCh. 3 - Prob. 29CCh. 3 - Prob. 30CCh. 3 - Prob. 31CCh. 3 - Prob. 32CCh. 3 - Prob. 33CCh. 3 - Prob. 34CCh. 3 - Prob. 35CCh. 3 - Write a Java program for a matrix class that can...Ch. 3 - Write a class that maintains the top ten scores...Ch. 3 - Prob. 38PCh. 3 - Write a program that can perform the Caesar cipher...Ch. 3 - Prob. 40PCh. 3 - Prob. 41PCh. 3 - Prob. 42PCh. 3 - Prob. 43P
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