PHP Classes

Simple PHP Cipher Encryption: Encrypt and decrypt text by mapping characters

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simple-cipher 1.0GNU General Publi...5PHP 5, Conversion
Description 

Author

Dave Smith

This class can encrypt and decrypt text by mapping characters.

It can take a text string and encrypt it using two text strings that define which characters should be mapped to what other characters depending on the position of the character in the string.

The class can also do the opposite, i.e. take a previously encrypted string and invert the process to recover the original string.

The key strings with the characters to be mapped are configurable.

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Example

<?php
include('simplecipher.class.php');
$cipher = new simpleCipher();

$message = 'Message 106: This is a "secret" message, which includes some characters that will not be encrypted.';
$messageSave = $message;

$cMessage = $cipher->encryptMessage($message);
$cMessageSave = $cMessage;

echo '<strong>encrypted:</strong> '.$cMessage.'<br>';

$tMessage = $cipher->decryptMessage($cMessage);

echo '<strong>decrypted:</strong> '.$tMessage.'<hr>';

$message = 'Notice "the" and "the" and "the" are all different in the encrypted message, making the cipher difficult to break!!!';

$cMessage = $cipher->encryptMessage($message);

echo '<strong>encrypted:</strong> '.$cMessage.'<br>';

$tMessage = $cipher->decryptMessage($cMessage);

echo '<strong>decrypted:</strong> '.$tMessage.'<hr>';

echo '<strong>We are now going to generate a new cipher map using the generateMap method</strong><br><br>';

$cipher->generateMap();

$message = 'Not only are characters mapped to replacements, the replacement character is also determined by its position in the message.';

$cMessage = $cipher->encryptMessage($message);

echo '<strong>encrypted:</strong> '.$cMessage.'<br>';

$tMessage = $cipher->decryptMessage($cMessage);

echo '<strong>decrypted:</strong> '.$tMessage.'<hr>';

echo '<strong>We will now attempt to decrypt our first message<br><br></strong>';

echo '<strong>message:</strong> '.$messageSave.'<br>';

echo '<strong>encrypted:</strong> '.$cMessageSave.'<br>';

$tMessage = $cipher->decryptMessage($cMessageSave);

echo '<strong>decrypted:</strong> '.$tMessage.'<br><br>';

echo '<strong>which did not work because the map changed. We can encrypt it using the new map.</strong><br><br>';

$cMessage = $cipher->encryptMessage($messageSave);

echo '<strong>encrypted:</strong> '.$cMessage.'<br>';

$tMessage = $cipher->decryptMessage($cMessage);

echo '<strong>decrypted:</strong> '.$tMessage.'<hr>';
?>


Details

Class: simpleCipher
Version: 1.0 11/17/2016

Copyright 2015 Wagon Trader, All Rights Reserved


Description:

This class will encrypt and decrypt text using a cipher that determines the replacement character by a mapped character and position in the message.

Since the position is also considered, common words like 'the' will always be different in encrypted message.

Files:

simplecipher.class.php - Main class

example.php - Simple application example


Installation:

Upload files to a web accessible location on your server (eg. public_html)


Configuration:

No configuration needed.

If you use this in production, you will want to generate and save a new map. Simply run the following code in a script.

<?php
include('simplecipher.class.php');
$cipher = new simpleCipher();
echo $cipher->generateMap(true);
?>

Copy the new map and use it to replace the $cipherMap variable in class.

Usage:

Refer to example.php file for a simple usage example.

Refer to simplecipher.class.php for available methods and their usage.


Changelog

1.0

Initial release

  Files folder image Files  
File Role Description
Accessible without login Plain text file example.php Example Usage Example
Accessible without login Plain text file license.txt Lic. License
Accessible without login Plain text file manual.txt Doc. Documentation
Plain text file simplecipher.class.php Class Main Class

Downloadsimple-cipher-2016-11-17.zip 15KB
Downloadsimple-cipher-2016-11-17.tar.gz 14KB
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Great job on custom encryption.
6 years ago (Anthony Amolochitis)		72%StarStarStarStar
Great job on custom encryption.
6 years ago (Anthony Amolochitis)		72%StarStarStarStar
 

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