Variable length structural information coding and decoding method

Abstract

When structural information data, i.e. being embedded in information hiding technique, current techniques can not hide as much information as possible in as small length range as possible. The disclosed method structures all information of sub fields to structured information, uses different field coding to represent different meanings so as to form integrated signal sequence. Final sequence is obtained after following steps: inserting redundant bytes in certain amount in front signal sequence; encrypting signal sequence by using special cipher key; carrying out test of data correctness; inserting check code in front cryptograph string of the signal sequence. Advantages are: multiple formats for information fields, reasonable mode for arranging each information field in signal sequence; large amount of information included; raised safety factor of information and correct recognition rate greatly.

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

Images