Variable length structural information coding and decoding method

Abstract

The invention relates to a method for encoding and decoding variable-length structured information, which belongs to the technical field of information encoding. In the prior art, when the structural information data, that is, the signal sequence, is embedded in the information hiding technology, it is impossible to hide as much information as possible within the smallest possible length range. In the method of the present invention, all subfield information constitute a structured information, and different field codes represent different meanings, which are combined into a complete signal sequence; a certain number of redundant bytes are inserted in front of the signal sequence, using After the signal sequence is encrypted by a special key, the correctness of the data is checked, and finally the check code is inserted in front of the ciphertext string of the information sequence to obtain the final sequence. By adopting the method of the present invention, the format of each field information can be varied, the arrangement of each field information in the signal sequence is relatively reasonable, the amount of information contained is large, and the safety factor and correct recognition rate of the information are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of information coding, and in particular relates to a method for coding and decoding variable-length structured information. Background technique [0002] Information hiding technology is to study how to hide a certain information in another public information, and then transmit the hidden information through public transmission. Since the media releases containing hidden information are public, it is difficult for possible detectors to judge whether the hidden information exists from the public information, and it is even more difficult to intercept the hidden information, so as to achieve the purpose of ensuring the security of the information. For example, digital watermarking technology, as an effective digital product copyright protection and data security maintenance technology, is a branch of information hiding technology research field. Digital watermarking technology is to hide a mark (watermark) w...

AI Technical Summary

Problems solved by technology

The current technology cannot solve this problem well, and its main defect is that there is no reasonable encoding method. In order to encode as much information as possible, the names of the fields in the structure are not stored, so only specific structural information can be encoded. , such as encoding the above-mentioned structured data used to describe the printing of security documents; the content of each subfield in the structured information is fixedly assigned a certain maximum length, even if the content of the field is not enough or empty, a fixed-length storage is still allocated space, resulting in a waste of coding space; because the content and length of each subfield of structured information are fixed, it cannot be dynamically expanded; due to the limitation of the encoding method, only if the structure of the structure and the length limit of each subfield are known in advance can it be correct decode the encoded information

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