Method for encryption and decryption of data using pixel

Abstract

A method for encrypting and decrypting data prevents counterfeiting or forgery of various on not line or off-line prints. A graphic (image) or text (character, digit, figure, etc.) to be encrypted is fragmented into minute pixels as basic units. In connection with a shadow, a color, and a size of the fragmented pixels, a pixel having a predetermined characteristic value is defined as a reference pixel, and then non-reference pixels having different characteristic values with respect to the reference pixel are defined. A predetermined data value is allotted to each of the non- reference pixels, and the fragmented reference pixels are one-to-one substituted by the non- reference pixels. Thereby, desired information data can be inserted without changing the state of an original file to be encrypted. To this end, the method for encrypting data is generally divided into a pre-processing process and an encrypting process. The pre-processing process includes a step of grouping pixels, a step of designating and grouping address values, and a step of databasing the pixels and address values. The encrypting process includes a step of fragmenting background information, a step of randomly selecting a pixel group, a step of pixelizing insertion information, a step of substituting pixels, and a step of combining and outputting the background and insertion information. Further, the method for decrypting data is generally divided into a process of pre-processing encrypted background information, and a decrypting process. The pre processing process includes a step of receiving the encrypted background information again, and a step of fragmenting the background information. The decrypting process includes a step of analyzing the pixel to extract a non-reference pixel, a step of extracting the address value of a pixel group used, a step of selecting the used pixel group, and a step of converting the extracted pixel into data.

Description

technical field [0001] The invention relates to a method for encoding and decoding data, in particular to a method for encoding and decoding data using pixels. This method subdivides data such as characters, numbers, graphics, lines, and pictures that need to be coded into tiny pixels. The pixels of the data value are swapped with the subdivided reference pixels one by one, so that the required information data can be inserted without changing the state of the original file to be coded. Background technique [0002] Along with the rapid development of communication networks such as the Internet, people can make reservations and purchase various types of service tickets such as movie tickets, performance tickets, bus tickets, air tickets, boat tickets, and meal tickets on the Internet now. When making reservations and purchasing these tickets, various documents need to be checked in order to confirm the identity of the purchaser. Under normal circumstances, the documents re...

AI Technical Summary

Problems solved by technology

[0006] However, with the continuous expansion of its application fields, the certification procedures are becoming more and more complex, the logistics are becoming more and more diversified, the data required for certification is increasing, and the amount of information contained in commodities is also increasing.

Therefore, in the future, if the two-dimensional barcode is used as logistics information and market information, the data capacity of about 2000 characters is far from meeting the demand

In addition, 1D and 2D barcodes are not encoded, so when someone copies the code, it is difficult to detect whether said barcode is a copy or a counterfeit

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