A Reversible Encryption Routine for PHP

By Tony Marston
2005-04-15

Rotating each character a fixed number of positions

In this method each character is converted into a number, another number is added to it, then it is converted back into a different character from the same character set. This is how the ROT13 system works as it rotates each character 13 positions. This system is easy to break.

Tutorial pages:

A Reversible Encryption Routine for PHP
Rotating each character a fixed number of positions
Swapping between two different character strings
Manipulating the index number between the two strings
Customising the Encryption Algorithm
Class Variables
Class Constructor
The ConvertKey function
The ApplyFudgeFactor function
The CheckRange Function
The Decrypt function
Using the Encryption Class
Summary

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