US Patent 8694788 Security system

A security system includes an interface, a main computer, and an application server. The interface enables a user to access a remote document related to a product. The main computer stores documents related to the product and generates a pair of localized encryption keys. The encryption keys include a first key that encrypts data and second key that decrypts the data. An application server that is remote from the interface transmits and receives the document from the interface. The main computer authenticates the integrity of the document in a local operation by signing the document with the first key before it is transmitted to the interface and by signing the document with the second key after it is received from the interface. A method of authenticating the integrity of information related to a selected product stored on a main computer includes generating the localized pair of encryption keys; signing the document with the first key at the main computer; transmitting the signed document to an interface or a Web browser; and signing the document with the second key at the main computer when the document is received from the interface or the Web browser.