Project 1: Caesar Cipher

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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How to do a flowchart on Caesar cipher on paper?
Project 1: Caesar Cipher
Assignment Overview
In this assignment, we are going to implement a simple encoding and decoding of text. As a result of
working on this project, you will gain more experience with the use of:
1. string
2. if statement
3. for loop and while loop
Background
A rotation cipher is one of the simplest, plain-text ciphers, known since at least the time of Julius
Caesar. It takes in a plain-text string, and translates it into a new string based on a rotation of the
alphabet being used. The basis is a "rotation", a re-sequencing of an alphabet. Consider the
following example. Consider the alphabet being a single string consisting of the lower case English
letters as below (shown with each letter's associated index):
Transcribed Image Text:Project 1: Caesar Cipher Assignment Overview In this assignment, we are going to implement a simple encoding and decoding of text. As a result of working on this project, you will gain more experience with the use of: 1. string 2. if statement 3. for loop and while loop Background A rotation cipher is one of the simplest, plain-text ciphers, known since at least the time of Julius Caesar. It takes in a plain-text string, and translates it into a new string based on a rotation of the alphabet being used. The basis is a "rotation", a re-sequencing of an alphabet. Consider the following example. Consider the alphabet being a single string consisting of the lower case English letters as below (shown with each letter's associated index):
bcd
fghijkmnop 9rs
a
e
u
V
w xy z
0 12 3 4 5 6 7 89 1 1 1
1 1 1
2 2 2 22 2
1
1
0 12 3 4 5 6 78 9 0 1 2 3 4 5
1
Then a rotation of 3 means that the first three letters of the alphabet are moved to the end of the
sequence, while the other letters move up, as shown below. Notice that the movement is done one
letter at a time.
t
u
V
W Xy
hijkI
d
f
m n
r
a
C
e
1 2 2 2
90 1
1 2 3
5 6 7
8 9
1
1
1
1
1
2 2 2
6.
8
0 12 3 4
3
4
4-
Transcribed Image Text:bcd fghijkmnop 9rs a e u V w xy z 0 12 3 4 5 6 7 89 1 1 1 1 1 1 2 2 2 22 2 1 1 0 12 3 4 5 6 78 9 0 1 2 3 4 5 1 Then a rotation of 3 means that the first three letters of the alphabet are moved to the end of the sequence, while the other letters move up, as shown below. Notice that the movement is done one letter at a time. t u V W Xy hijkI d f m n r a C e 1 2 2 2 90 1 1 2 3 5 6 7 8 9 1 1 1 1 1 2 2 2 6. 8 0 12 3 4 3 4 4-
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