Patent ID: 6111953
Filing Date: 2000-08-29
Classification: G06Q,H04L

Abstract:
A device for indicating and verifying the authenticity of a document using data appearing on the document, the device comprising:an input device for receiving document identification data from the document when indicating the authenticity of the document, wherein at least a portion of the identification data is specific to the document and identifies the document, and for receiving the document identification data and encrypted authentication data from the document when verifying the authenticity of the document;a computing device, including a cryptographic processor and a memory, coupled to said input device to receive a first signal representing the document identification data when both indicating and verifying the authenticity of the document, and to also receive a second signal representing the encrypted authentication data when verifying the authenticity of the document and, in accordance with instructions in the memory, to perform a first cryptographic operation based on the document identification data to produce encrypted authentication data unique to the document when indicating the authenticity of the document, and to perform a second cryptographic operation based on the encrypted authentication data to produce decrypted authentication data and to perform a comparison of the decrypted authentication data with the document identification data when verifying the authenticity of the document;a first output device, coupled to said computing device, for affixing a representation of the encrypted authentication data on the document when indicating the authenticity of the document; anda second output device, coupled to said computing device, for displaying information regarding the authenticity of the document based on the comparison when verifying the authenticity of the document.