COMP 122 Lab 7 Lab Report and Source Code COMP 122 Lab 7 Lab Report and Source Code

COMP 122 Lab 7 Lab Report and Source Code
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COMP 122
Week 7 iLab
The focus of this lab is on using strings. You will have an opportunity to work with both C style
strings and the string data type. This lab also gives you an opportunity to use what you have
learned previously, including using functions, array processing, repetition, and selection. You
will also have an opportunity to work with file input and output.
You are to design and implement a program which does encryption and decryption of data
from files. Encryption is the process of taking plain lines of text and performing some
algorithmic transformation on the data to create an encrypted line of text which looks nothing
like the original. Decryption is the process of taking an encrypted line of text and performing
some algorithmic transformation on the data to recover the original line of plain text.
Encryption and Decryption Approach
Our approach to encryption and decryption involves two strings. The first is an encryption /
decryption string which we will allow to be up to 128 lower case alphabetical characters in
length. The second string is a line of text from a file that is to be encrypted or decrypted.
Our basic strategy for encrypting data is based on mapping alphabetical characters to specific
values, then doing some simple mathematical operations to create a new value. First of all,
every character in either the encryption string or the input string is mapped to a number
between 0 and 25 based on its position in the alphabet.
= 0