A Reversible Encryption Routine for PHP
By Tony Marston2005-04-15
Rotating each character a fixed number of positions
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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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