Citizen of Kidderminster required me to encrypt a database for their client Sony. The database was being used to hold contact details for customers registering to attend an exhibition held in various locations around the country.An RC4 encryption script with unique "key" was used to encrypt the existing data. Various forms on the registration site was then updated to encrypt details on a successful register.
The script works in such a way that if the same string was encrypted again, it wouldn't form the same code. So to compare a set of values both have to be decrypted using the same secret "key".
This secure technique is used on various forms on my management systems.