C-Code Shift Cipher

Thomas Norberg — Wed, 07 Jan 2009 00:16:45 +0000

You need these following files to make it work:
This is the Dictionary so that it can check the words in the file
Cipher file that you can use to change to plain text
Cipher file much of same #2
Cipher file much of same #3
Cipher file much of same #4
Input file to change to cipher text
Input file much of the same #2
Input file much of the same #3
/* Project #4 Project Description: In this project, you will implement three basic cryptography procedures for shift cipher. Cryptography refers to the use of encryption (or encoder) to convert plain text information into unintelligible gibberish (cipher text) for security purposes. A corresponding decryption algorithm (or decoder) will convert the cipher text back to the plain text with the correct decryption key. A code breaker tries to decode the cipher text without the key. Shift cipher is one of the simplest cryptography systems. It encrypts the plain text message by shifting each character for fixed number of characters down the relevant alphabet. This fixed number is called the encryption key. For example, consider the English alphabet, when the encryption key is 2, a, b, c, …, x, y, z will be shifted to c, d, e, …, z, a, b, respectively. A shift cipher with encryption key 2 will convert the plain text “project” into cipher text “rtqlgev”. The decoder in this case will be shifting each letter 2 position to the left, that is, replacing a, b, c, …, x,y,z in the cipher text by y, z, a, …, v, w, x, respectively. It suffices for a code breaker in this case to guess the value of the encryption/decryption key. You need to write a single program to perform these three basic cryptography procedures at the user’s choice. Assuming that a.out is the executable of your program: a.out 1 input output key encodes input file with key and write cipher text to output a.out 2 input output key decodes input file with key and write plain text to output a.out 3 input output breaks the cipher text input and write plain text to output The code breaker procedure tries all the possible key values and matches the words in the corresponding plain text with the words in a dictionary “mydictional.txt”. The key that produces the maximal number of matches will be considered as the key and will be used to generate the plain text file output...

Rating: 5.5/10 (2 votes cast)

C-code Maze

Thomas Norberg — Wed, 07 Jan 2009 00:01:25 +0000

You will need these files to make work:
Maze 1
Maze 2
Abitrary Output file 1
Abitrary Output file 2
You will need these files to run the program file after compilation.
Project #3
Project Description: In this project, you will implement a program for Easter egg hunt in an 11x19 maze. Your program should (1) read in from an input file the maze information; (2) show the egg hunter.s current location; and (3) repetitively moves the egg hunter to the direction of his chooses until the egg is found, or the hunter gets lost and asks for help, or the hunter quits. Your program should display the floor plan of the maze and a path to find the egg at the end. A master program, in the format of executable file, and sample input files will be posted on the class web site...

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C-Code Shift Cipher

C-code Maze