renyuntao / vigenere-cipher

A simple tool to encrypt/decrypt a file.

Decription

A simple tool to encrypt/decrypt a file by keyword,which can encrypt/decrypt
all printable character in ASCII table.
As for keyword,it can also access all printable character in ASCII table.

Usage

./vigenere_cipher [-o output_file] [-e] [-d] [-h] input_file

Parameter:
-e: Encrypt the file.[Default]
-d: Decrypt the file.
-o: Specify the output_filt.
-h: Show help.

Note:
If you not use the -o parameter to specify a output file, then the cipertext will be output to a default file,and when after encrypt/decrypt the file,the original file(i.e input_ file)will be deleted.So if you want to reserve the the orig- inal file,please use the -o parameter to specify a output file.

How to run the program?

You can run the program as

$ make        
$ ./vigenere_cipher -h

Example

Encrypt the file text:

$ ./vigenere_cipher text       
Enter the keyword: Lemon     

then will create a new file named text.cry that contain the ciphertext.
Decrypt the file text.cry:

$ ./vigenere -d text.cry      
Enter the keyword: Lemon

then a new file named text will be created,and the original text will in it.

Try it on my website

You can try this tool on my website:
Encrypt: http://www.studyandshare.info/encrypt.html
Decrypt: http://www.studyandshare.info/decrypt.html

Reference

Reference Wikipedia.
In addition,I have enhanced the function of encrypy and decrypt,such as it can
encrypt/decrypt all printable character in ASCII table.