1. A computer-implemented document integrity verification method comprising: receiving an image format document into a computer readable medium, wherein the image format document represents a printed document containing a first original integrity verification code (IVC); generating a first verification data sequence from the image format document from a section of the document that excludes the first original IVC, wherein generating a first verification data sequence comprises performing an optical character recognition (OCR) process on the image format document; generating a first modified verification data sequence from the first verification data sequence in accordance with a set of modification rules, wherein at least one element of the first verification data sequence, between the first and final elements of the first verification data sequence, is modified in the first modified verification data sequence; generating a first verification IVC, wherein generating a first verification IVC comprises performing a one-way operation on the first modified verification data sequence, and wherein the modification rules render tampering undetectable, by a comparison of the first verification IVC with the first original IVC, for at least one element within the first verification data sequence; comparing the first verification IVC with the first original IVC; and reporting an indication of tampering to the printed document, responsive to the comparison of the first verification IVC with the first original IVC.
1. A computer-implemented document integrity verification method comprising: receiving an image format document into a computer readable medium, wherein the image format document represents a printed document containing a first original integrity verification code (IVC); generating a first verification data sequence from the image format document from a section of the document that excludes the first original IVC, wherein generating a first verification data sequence comprises performing an optical character recognition (OCR) process on the image format document; generating a first modified verification data sequence from the first verification data sequence in accordance with a set of modification rules, wherein at least one element of the first verification data sequence, between the first and final elements of the first verification data sequence, is modified in the first modified verification data sequence; generating a first verification IVC, wherein generating a first verification IVC comprises performing a one-way operation on the first modified verification data sequence, and wherein the modification rules render tampering undetectable, by a comparison of the first verification IVC with the first original IVC, for at least one element within the first verification data sequence; comparing the first verification IVC with the first original IVC; and reporting an indication of tampering to the printed document, responsive to the comparison of the first verification IVC with the first original IVC. 6. The method of claim 1 wherein the first modified verification data sequence is shorter than the first verification data sequence.