Patent ID: 7500099

Claim:
A computer-implemented method for preventing unauthorized data postings from being accepted by a computer, comprising the steps of: receiving at a first computer from a second computer a request for a data form file, the data form file having a field for entry by a user of posting data and for sending the entered posting data to the first computer; in response to the received request, generating at the first computer a first data message; generating at the first computer a first data identifier value from the first data message using a message digest algorithm; and sending from the first computer to the second computer the data form file, the first data identifier value, and a first data item, wherein the first data item is a portion of the first data message used to generate the first data identifier value; receiving at the first computer from the second computer a posting, wherein the posting comprises posting data entered into the field of the data form file by the user at the second computer, and wherein the posting further comprises the first data identifier value and the first data item; generating at the first computer a second data identifier value from a second data message using the message digest algorithm, wherein the second data message comprises the first data item; determining at the first computer if the first data identifier value received with the posting is the same as the second data identifier value; when the first data identifier value is the same as the second data identifier value, allowing the posting data to be posted to the first computer; and when the first data identifier value is not the same as the second data identifier value, declining to allow the posting data to be posted to the first computer.