1. A system for digital analysis, using a handheld device, of authenticity and integrity of a document, the system comprising: a central processing unit (CPU) to execute instructions needed for encoding and decoding information, including a CRC32 code generated from content of the document, hidden in an Entropy Tag Code (ETCODE) image to be printed with the document, so that a message, previously hidden, will appear in a copy of the document, indicating the document is an unauthorized copy; a digital camera to capture the ETCODE image; a storage unit for storing information associated with the document; an information input unit to intercept user input events; a connectivity component that allows the user to connect to a remote database that has information for the ETCODE image and the document corresponding to the ETCODE image, and a display for displaying the ETCODE image, wherein the ETCODE image includes blocks, wherein each block comprises pixels that can represent the bit 0 or bit 1 , where bit 0 is represented by a totally random pattern of the pixels and bit 1 is represented by a quasi-random pattern of the pixels.