Starting from:
$30
CIS3360-Assignment 1 Vigenèr Cipher Solved
In this you'll write a program that encrypts the alphabetic letters in a file using the
Vigenère cipher. 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. 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.
3. Your program should open the two files, echo the processed 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 (512) of alphabetic
characters, pad the last block as necessary with the letter 'X'. Make sure that all the input characters
are lower case only.
• All source code must be in exactly one file of type .c, .cpp, or .java
Encryption Key File Format
The encryption key is plain text that may contain upper and lower case letters, numbers, and other
text. The input must be stripped of all non-alphabetic characters. Please note that the input text must
be converted to contiguous lower case letters to simplify the encryption process.
Format of the File to be Encrypted
The file to be encrypted can be any valid text file with no more than 512 letters in it. (Thus, it's safe
to store all characters in the file in a character array of size 512, 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. In order
to simply the encryption, all letters should be converted to lower case letters. In the event the
plaintext input file is less than 512 characters, pad the input file with a lowercase ‘x’ until the 512
character input buffer is full.
Output Format
The program must output the following to the console (terminal) screen:
1. Echo the unmodified input key file
2. Echo the unmodified 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.
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 convert an upper case input letter to the corresponding
lower case letter, i.e., it should convert an ‘A’ to 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 512, 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 File1
“I think and think for months and years. Ninety-nine times, the conclusion is false.
The hundredth time I am right.” – Albert Einstein “Imagination is more important than
knowledge. For knowledge is limited, whereas imagination embraces the entire world,
stimulating progress, giving birth to evolution.” – Albert Einstein
Sample Plaintext File2
“Fall in love with some activity, and do it! Nobody ever figures out what life is all
about, and it doesn't matter. Explore the world. Nearly everything is really
interesting if you go into it deeply enough. Work as hard and as much as you want to
on the things you like to do the best. Don't think about what you want to be, but what
you want to do. Keep up some kind of a minimum with other things so that society
doesn't stop you from doing anything at all.” - Richard Feynman
Corresponding Encrypted Output File
ntstvxlbyxdqgrxcdqopmpnigbyrdugvbasumqgrzxzrmynyiuchvhbsbzvnwnsldptisbnnqumwwvxa
zxuafkmxlqpwpvvmlmjgkplammrrgrvxzmgpazuzwzqpzcriamxyefdvbctjbuylczxgceehhkttqpva
czlzkyorwhszpatlnsfcqueezfuyefmassampvxdwervqhcxcvemwquiyshvwlvuvobuoosruvnhacoe
shcknneussxfcgoaeblwndiadtbghrmrzzdjaardpfdbiyqieazczabruwglxzflagnwucgjlnkwqvml
ddzwwgawaicbfyikvflamvgmegzobnrbxrepzvuaezqnqytunnqflkfpjlobfjmloqxkqqexkhkltiba
dbclohkltibadbfpifjfqbatebobxpfjxdfkxqflkbjyoxzbpqebbkqfobtloiapqfjrixqfkdmoldob
ppdfsfkdyfoqeqlbslirqflkxiyboqbf
Sample Run Command
C or C++ program:
prompt ./a.out key1.txt plainText1.txt
Java program:
prompt java vigenere key1.txt plainText1.txt
1 This is k2.txt in the homework 1 ZIP file.
2 This is p2.txt in the homework 1 ZIP file.
Sample inputs & outputs
There are three commands and their resultant output shown below. They are:
• cat k1.txt
• cat p1.txt
• ./a.out k1.txt p1.txt
These commands and their output are described below. A couple of things to note, this is the text output
from a session on Eustis and the prompt begins with the login NID followed by the terminal ID and the
current working directory. Each of the cases below are in the same working directory hw1 in the $HOME
directory, indicated by the ~ character.
NID@termID:~/hw1$ cat k1.txt (catalogs the first key file)
bbbbbbbbb
bbbbbbbbb
bbbbbbbbb
bbbbbbbbb
bbbbbbbbb
bbbbbbbbb
bbbbbbbbb
bbbbbbbbb
NID@termID:~/hw1$ cat p1.txt (catalogs the first plaintext file)
"If you find that you're spending almost all your time on theory, start turning
some attention to practical things; it will improve your theories. If you find that
you're spending almost all your time on practice, start turning some attention to
theoretical things; it will improve your practice." - Donald Knuth
NID@termID:~/hw1$ ./a.out k1.txt p1.txt (encrypts the key/plaintext files)
Vigenere Key:
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
Plaintext:
ifyoufindthatyourespendingalmostallyourtimeontheorystartturningsomeattentiontopr
acticalthingsitwillimproveyourtheoriesifyoufindthatyourespendingalmostallyourtim
eonpracticestartturningsomeattentiontotheoreticalthingsitwillimproveyourpractice
donaldknuthxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Ciphertext:
jgzpvgjoeuibuzpvsftqfoejohbmnptubmmzpvsujnfpouifpsztubsuuvsojohtpnfbuufoujpoupqs
bdujdbmuijohtjuxjmmjnqspwfzpvsuifpsjftjgzpvgjoeuibuzpvsftqfoejohbmnptubmmzpvsujn
fpoqsbdujdftubsuuvsojohtpnfbuufoujpoupuifpsfujdbmuijohtjuxjmmjnqspwfzpvsqsbdujdf
epobmelovuiyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy
yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy
yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy
yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyNID@termID:~/cis3360/hw1/sum2018$
Each of the four key & plaintext files are included in the ZIP file for this assignment. ALSO note that
the test file hw1Test.sh runs all four plaintext and key files thru your vigenere code. It can be
invoked using the command ./hw1Test.sh vigenere.cpp. (The filename’s extension
should match the source code, that is .c fo C, .cpp for C++, and .java for Java.)
Vigenère cipher. 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. 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.
3. Your program should open the two files, echo the processed 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 (512) of alphabetic
characters, pad the last block as necessary with the letter 'X'. Make sure that all the input characters
are lower case only.
• All source code must be in exactly one file of type .c, .cpp, or .java
Encryption Key File Format
The encryption key is plain text that may contain upper and lower case letters, numbers, and other
text. The input must be stripped of all non-alphabetic characters. Please note that the input text must
be converted to contiguous lower case letters to simplify the encryption process.
Format of the File to be Encrypted
The file to be encrypted can be any valid text file with no more than 512 letters in it. (Thus, it's safe
to store all characters in the file in a character array of size 512, 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. In order
to simply the encryption, all letters should be converted to lower case letters. In the event the
plaintext input file is less than 512 characters, pad the input file with a lowercase ‘x’ until the 512
character input buffer is full.
Output Format
The program must output the following to the console (terminal) screen:
1. Echo the unmodified input key file
2. Echo the unmodified 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.
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 convert an upper case input letter to the corresponding
lower case letter, i.e., it should convert an ‘A’ to 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 512, 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 File1
“I think and think for months and years. Ninety-nine times, the conclusion is false.
The hundredth time I am right.” – Albert Einstein “Imagination is more important than
knowledge. For knowledge is limited, whereas imagination embraces the entire world,
stimulating progress, giving birth to evolution.” – Albert Einstein
Sample Plaintext File2
“Fall in love with some activity, and do it! Nobody ever figures out what life is all
about, and it doesn't matter. Explore the world. Nearly everything is really
interesting if you go into it deeply enough. Work as hard and as much as you want to
on the things you like to do the best. Don't think about what you want to be, but what
you want to do. Keep up some kind of a minimum with other things so that society
doesn't stop you from doing anything at all.” - Richard Feynman
Corresponding Encrypted Output File
ntstvxlbyxdqgrxcdqopmpnigbyrdugvbasumqgrzxzrmynyiuchvhbsbzvnwnsldptisbnnqumwwvxa
zxuafkmxlqpwpvvmlmjgkplammrrgrvxzmgpazuzwzqpzcriamxyefdvbctjbuylczxgceehhkttqpva
czlzkyorwhszpatlnsfcqueezfuyefmassampvxdwervqhcxcvemwquiyshvwlvuvobuoosruvnhacoe
shcknneussxfcgoaeblwndiadtbghrmrzzdjaardpfdbiyqieazczabruwglxzflagnwucgjlnkwqvml
ddzwwgawaicbfyikvflamvgmegzobnrbxrepzvuaezqnqytunnqflkfpjlobfjmloqxkqqexkhkltiba
dbclohkltibadbfpifjfqbatebobxpfjxdfkxqflkbjyoxzbpqebbkqfobtloiapqfjrixqfkdmoldob
ppdfsfkdyfoqeqlbslirqflkxiyboqbf
Sample Run Command
C or C++ program:
prompt ./a.out key1.txt plainText1.txt
Java program:
prompt java vigenere key1.txt plainText1.txt
1 This is k2.txt in the homework 1 ZIP file.
2 This is p2.txt in the homework 1 ZIP file.
Sample inputs & outputs
There are three commands and their resultant output shown below. They are:
• cat k1.txt
• cat p1.txt
• ./a.out k1.txt p1.txt
These commands and their output are described below. A couple of things to note, this is the text output
from a session on Eustis and the prompt begins with the login NID followed by the terminal ID and the
current working directory. Each of the cases below are in the same working directory hw1 in the $HOME
directory, indicated by the ~ character.
NID@termID:~/hw1$ cat k1.txt (catalogs the first key file)
bbbbbbbbb
bbbbbbbbb
bbbbbbbbb
bbbbbbbbb
bbbbbbbbb
bbbbbbbbb
bbbbbbbbb
bbbbbbbbb
NID@termID:~/hw1$ cat p1.txt (catalogs the first plaintext file)
"If you find that you're spending almost all your time on theory, start turning
some attention to practical things; it will improve your theories. If you find that
you're spending almost all your time on practice, start turning some attention to
theoretical things; it will improve your practice." - Donald Knuth
NID@termID:~/hw1$ ./a.out k1.txt p1.txt (encrypts the key/plaintext files)
Vigenere Key:
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
Plaintext:
ifyoufindthatyourespendingalmostallyourtimeontheorystartturningsomeattentiontopr
acticalthingsitwillimproveyourtheoriesifyoufindthatyourespendingalmostallyourtim
eonpracticestartturningsomeattentiontotheoreticalthingsitwillimproveyourpractice
donaldknuthxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Ciphertext:
jgzpvgjoeuibuzpvsftqfoejohbmnptubmmzpvsujnfpouifpsztubsuuvsojohtpnfbuufoujpoupqs
bdujdbmuijohtjuxjmmjnqspwfzpvsuifpsjftjgzpvgjoeuibuzpvsftqfoejohbmnptubmmzpvsujn
fpoqsbdujdftubsuuvsojohtpnfbuufoujpoupuifpsfujdbmuijohtjuxjmmjnqspwfzpvsqsbdujdf
epobmelovuiyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy
yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy
yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy
yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyNID@termID:~/cis3360/hw1/sum2018$
Each of the four key & plaintext files are included in the ZIP file for this assignment. ALSO note that
the test file hw1Test.sh runs all four plaintext and key files thru your vigenere code. It can be
invoked using the command ./hw1Test.sh vigenere.cpp. (The filename’s extension
should match the source code, that is .c fo C, .cpp for C++, and .java for Java.)
1 file (166.1KB)
