Program must be write in C In this assignment you will write a program that encr

Question

Program must be write in C

In this assignment you will write a program that encrypts the alphabetic letters in a file using the Hill

cipher where the Hill matrix can be any size from 2 x 2 up to 9 x 9. Your program will take two

command line parameters containing the names of the file storing the encryption key and the file to

be encrypted. The program must generate output to the console (terminal) screen as specified

below.

Command Line Parameters

1. Your program must compile and run from the command line.

2. The program executable must be named “hillcipher” (all lower case, no spaces or file

extension).

3. input the required file names as command line parameters. Your program may NOT

prompt the user to enter the file names. The first parameter must be the name of the

encryption key file, as described below. The second parameter must be the name of the

file to be encrypted, as also described below. The sample run command near the end of

this document contains an example of how the parameters will be entered.

4. Your program should open the two files, echo the input to the screen, make the

necessary calculations, and then output the ciphertext to the console (terminal) screen

in the format described below.

Note: If the plaintext file to be encrypted doesn't have the proper number of alphabetic characters,

pad the last block as necessary with the letter 'X'. (Yes, this is different from what is in our class

slides, but it is necessary for us to do this so we can know what outputs to expect for our test inputs.

Program Submission Instructions:

You must submit your source code file

The source code file must be submitted in Webcourses from the assignment page

All source code must be in exactly one file of type .c, .cpp, or .java

Encryption Key File Format

The encryption key file will store a single positive integer, n (1 < n < 10), on the first line, indicating

the number of rows and columns in the encryption matrix. The following n lines will contain the

contents of each row, in order, of the encryption matrix, separated by spaces.

Format of the File to be Encrypted

The file to be encrypted can be any valid text file with no more than 9991 letters in it. (Thus, it's

safe to store all characters in the file in a character array of size 10000, including any padding

characters.) Please note that the input text file will also generally have punctuation, numbers,

special characters, and whitespace in it, which should be ignored. You should also ignore whether a

letter is uppercase or lowercase in the input file. Thus, you should treat ‘A’ and ‘a’ the same in your

program.

Output Format

The program must output the following to the console (terminal) screen:

1. Echo the input key file

2. Echo the input plaintext file

3. Ciphertext output produced from running the cipher against the input plaintext file.

The ciphertext output portion should consist of only lowercase letters in rows of exactly 80 letters

per row, except for the last row, which may possibly have fewer. These characters should

correspond to the ciphertext produced by encrypting all the letters in the input file. Please note that

only the alphabetic letters in the input plaintext file will be encrypted. All other characters should

be ignored.

What to Turn In over WebCourses

You must submit this assignment in the form specified at the top of this assignment.

Program Notes and Hints

Your program must read in an input plaintext file that may contain uppercase letters, lowercase

letters and non-letter characters. Your program must distinguish between these three groups so

that only the letters get encrypted. All non-letter characters in the file are simply skipped and not

counted as part of the plaintext. Please note that although both upper case and lower case letters

will be encrypted, your program should not treat them differently, that is, the program should

process an upper case input letter the same as the corresponding lower case letter, i.e., it should

treat an ‘A’ the same as an ‘a’.

One possible breakdown to solve this problem is as follows:

1) Write a section of code or function that reads only the upper and lower case letters in the input

file into an char array of size 10000, storing only the appropriate lowercase letters in the character

array.

2) Write a section of code or function that takes as input the array from section 1 and the

encryption key and produces an array of ciphertext storing only lowercase letters.

3) Write a section of code or function that takes as input the array storing the ciphertext and

outputs it to the screen in the format specified. Additional functions or code will be needed to echo

the input key and plaintext files.

Sample Key File

4

9 12 13 1

7 3 6 9

8 4 2 1

10 5 15 3

Sample Input File

Security professionals have said for years that the only way to make a

computer truly secure is for it to not be connected to any other computers, a

method called airgapping. Then, any attack would have to happen physically,

with the attacker actually entering the room and accessing the computer that

way, which is incredibly unlikely. In the case of computers containing highly

sensitive information, additional, physical security can always be added in

the form of security guards, cameras, and so on.

Researchers at Georgia Institute of Technology have uncovered a vulnerability

in all computers, however, which can be exploited regardless of an air gap.

It’s a vulnerability which you’d never suspect, and it’s one that’s hard to

fight against. All CPUs emit electromagnetic signals when they are performing

tasks, and the first thing these researchers discovered was that binary

ones and zeroes emit different levels. The second thing they discovered is

that electromagnetic radiation is also emitted by the voltage fluctuations

and that it can be read from up to six meters away. These signals, by the

way, are known as side-channels, and they are well-documented in the

cryptography field.

Corresponding Output File

wsceafwvgznsacsihctehylsayiyanlevvrznraqaimmhdcajbjnuqowykyivehgkiztslktzvtlhxbb

lehmcpoddwkbnrmwpszcognnoxhsujopvehggfgfunbegpydafnalyubtzumbaryxctoolpkueyssrjy

cdyhojobqftmdqgbdfftfpcmptrlqblscygqqqdxwtlikntstkzynvmmvpysnfggiyyorwarxoifrocr

rcncuxmfjhrdnuqlnmwfonkzfaqrzcsxurclysqewceqsrudvehgixiljruwhapsojuzfyktsnyjyhwl

vrkceovbtuqheptotuqheqeyygyqfrognudutffdcjkvhektblwuzixkijszqyjnwsceafwvzvpdjjwu

nqqfwxruffhfxpkedwbggfgfxpqkrduinkpehormclniilpmejihjohafckdfanspsnorbauspqbypan

fmxwfpgccdibgdcrdqevwnmtyvwhdyqzyiusrivktliuywsytxpbihilgmtlonudnaxuhkxypwnahkql

mtcpzdugihctxighzgbyyjitpujkqnitbwpwwrsvvvkqpzzllwxwapqpkwkocnmxnnkwrdrpgvwblrtl

ybybnynehxqikxelwhtopgejztqwwxruaplojwfyihbunvmmtqqztfvrperkihifvkobcjypcxngpfie

ytgpolihmwfdkrcjkwkoebdcgdqzyqymixqhncybvbdnqksubaryhimvzptvjahmwbzifyrgmprwqgkk

edkrrojkpigzojqpqhqdrxlrzqtytrakzkfizjlbuijltoypwlshrrfjnqhmgxrkgzedkeooqpribrpd

rmyvbhwowplkkiakbwktopebrmcntrjpbcipirmbpwerlwfqotefguzlhxqixnsmyuwscauakrjiomfj

tounfowfrmrauhyhppnt

Sample Run Command

C or C++ program:

prompt> ./hillcipher spr17Key4.txt hill-17spring- 01

Java program:

prompt> java hillcipher spr17Key4.txt hill-17spring- 01

Grading Rubric

The total possible score for this program is 100 points. The following point values will be deducted

for the reasons stated:

[ -100 points ] Your program does not successfully compile from the command line with one of

these commands:

C program: prompt> gcc –o hillcipher [your_file_name].c

C++ program: prompt> g++ –o hillcipher [your_file_name].cpp

Java program: prompt> javac hillcipher.java

Note: If you are submitting a Java program, the class file must be named “hillcipher.java”

and the class name must be “hillcipher”.

[ -90 points ] Your program does not run from the command line without error or produces no

output.

[ -70 points ] The program compiles, runs, and outputs the key matrix and input file, but crashes

thereafter or produces no encryption output.

[ -50 points ] The program compiles, runs, echoes the inputs, and generates encryption output,

but the encryption output is incorrect (ignoring case) and it is not formatted correctly (not all

letters or not all lowercase or not 80 letters per line).

[ -25 points ] The program compiles, runs, echoes the inputs, generates encryption output, and

the encryption output is correct (ignoring case), but it is formatted incorrectly (not all letters or not

all lowercase or not 80 letters per line).

[ -25 points ] The program compiles, runs, echoes the inputs, and generates encryption output,

but the encryption output is incorrect (ignoring case) although it is formatted correctly (all

lowercase letters, 80 letters per line).

[ no deductions ] The program compiles, runs, echoes the inputs, generates encryption output,

the encryption output is correct (ignoring case), and it is formatted correctly (all lowercase letters,

80 letters per line).

output should look like this

mmc@d7 bash 97x45 5spring java hillcipher spr txt hill-15spring-01 r15Ke Key matrix 12 13 7 3 6 9 8 4 2 1 10 5 15 3 Plaintext security professionalshavesaidforyearsthattheonlywaytomakeacomputertrulysecureisf or ittonotbeconnectedtoanyothercomputersamethodcalledairgappingthenanyattackwould havetohappenphysicallywiththeattackeractuallyente ringt heroornandaccessingthecompu terthatwaywhichis incredibly unlikely inthecaseofcomputerscontaininghighlysensitive informationadditionalphysicalsecuritycanalways beaddedintheform of securityguardsca merasandsoonresearchersatgeorgiainstituteoftechnologyhaveuncoveredavulnerability inallcomputershoweverwhichcanbeexploited regardlessofanairgapitsavulnerabilitywhi chyoudneversuspectand itsonethatshardtofightagainstallcpusemitelect romagneticsign als whenthey are performingtasks andthefirstthingthese researchersdiscoveredwas thatbi na ryone sandze roesemitdifferentlevelsthesecondthingtheydiscoveredisthat electromag netic canber me tersawaythesesignalsbythewaya reknownassidechannelsandtheya rewelldocumentedinth ecryptographyfieldxx Ciphertext ws ceafwwgznsacsihcte hylsayiyanlevvrznra gaimmhdcaj bjnuqowykyivehgkiztslkt z vtlhxbb lehmcpoddwkbn rmwpszcognnoxhsujopvehggfgfunbegpydafnalyubtzumbaryxctoolpkueyss rjy cdyho jobqftmdqgbdfftfpcm pt r lqbliss cygqqqdxwtt likntstkzynvmmvpysnfggiyyorwarxoifrocr rcncuxm fjhrdnuqunmwfonkzfaqrzcsxurclys qewcegs rudvehgixilji ruwhaps oj uz fyktsnyj yhwl vrkceovbtugheptotugheqeyygyqf rognu du ffdcjkvhektblwuzixkijszqyjnws cea fwvzvpdijwu nqqfwx ruffhfxpkedwbggfgfxpqk reduinkpeho rm clni ilpmejihjohafckdfanspsnorbauspqbypan fmxwfpgccdibgdcrdqevwnmtyvwhdyqzyius rivktliuywsytxpbihilgmt lonudnaxuhkxypwnahkql ybybnynehxgikxelwhtopgeji ztqwwx ruaplojwfyihbunv mmteqqztfvrperkihifvkobcj ypcxngpfie ytgpolihmwfdkrecj kwkoebdcgdqzyqymixqhncybvbdnqksuba ryhimvzptvjahmwbzifyrgmprwagkk edkrroj kpig zojqpqhqdrxlrzqtyt rakzkfizjubuijutoypwlshrrfjnqhmgxrkgzedkeooqpribrpd rmyvbhwowplkkiakbwktopebr mcnt injpbcipirmb pwerlwfgotefgu z lhxqixnsmyuwscauakrjiomfj tounfowfrm rauhyhppnt [561] michaelmcalpin@Hydrogen /data/Business/UCF/2015-Spring/CIS3360-MMc/Assignments/prog1/hill-1 spring

Explanation / Answer

package com.raphaelmiller;

public class HillCipher {

private String phrase

package com.raphaelmiller;

import java.io.*; import java.util.ArrayList;

public class HillCipher {

static File cipher; static File message; static File testFile = new File("/raphael/Projects/Hill Cipher/test_cipher"); static File testPhrase = new File("/raphael/Projects/Hill Cipher/keyphrase"); private ArrayList<Integer> matrixKey; private StringBuilder plaintextFile; private int[] cipherCoderMatrix;

private String phrase

public static void main(String[] args) { //implements the class Hillcipher in order for the methods to be used in the static method HillCipher hillCipher = new HillCipher(); //stringBuilder declaration StringBuilder encodedMessage = new StringBuilder(); //transition variables String[] phrase; int matrixSize; int[] messageToEncodeNum; //file string holders for arguments File argumentFile0 = new File(args[0]); File argumentFile1 = new File(args[1]); try { //loads the hill key matrixSize = hillCipher.loadCipher(argumentFile0); phrase = hillCipher.loadString(argumentFile1, matrixSize); int[] matrixNum; for (String messageToEncodeAlpha : phrase) { messageToEncodeNum = hillCipher.convertToInt(messageToEncodeAlpha); matrixNum = hillCipher.matrixMultipication(hillCipher.getMatrixKey(), messageToEncodeNum, matrixSize); encodedMessage.append(hillCipher.matrixIntToCharString(matrixNum)); } hillCipher.output(encodedMessage); //System.out.println(encodedMessage.toString()); } catch (IOException e) { e.printStackTrace(); } }

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