CN111027080A - Information hiding method and system based on OOXML composite document source file data area position arrangement sequence - Google Patents
Information hiding method and system based on OOXML composite document source file data area position arrangement sequence Download PDFInfo
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/60—Protecting data
- G06F21/602—Providing cryptographic facilities or services
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/60—Protecting data
- G06F21/62—Protecting access to data via a platform, e.g. using keys or access control rules
- G06F21/6209—Protecting access to data via a platform, e.g. using keys or access control rules to a single file or object, e.g. in a secure envelope, encrypted and accessed using a key, or with access control rules appended to the object itself
Abstract
The invention belongs to the technical field of information security, and discloses an information hiding method and system based on the position arrangement sequence of source file data areas of an OOXML (object oriented markup language) compound document, wherein the method comprises the following steps: establishing and maintaining an OOXML compound document library C; the sender acquires the position arrangement sequence of source file data areas of OOXML compound documents corresponding to mapping according to the secret information retrieval library C, further acquires corresponding OOXML compound documents d, and sends d to the receiver; a receiver obtains d, and obtains a source file data area position arrangement sequence p of the OOXML composite document corresponding to d; inquiring an OOXML compound document library C according to the p and the d to obtain mapped secret information; the system comprises an OOXML compound document library C module, an information hiding module and an information extracting module. The invention has better concealment and safety and better resistance to the information concealment detection technology.
Description
Technical Field
The invention belongs to the technical field of information security, and particularly relates to an information hiding method and system based on the position arrangement sequence of source file data areas of an OOXML (object oriented markup language) compound document.
Background
The network and the communication play an indispensable and vital role in social production and life of people, and the ubiquitous and open nature of the network provides great benefits and convenience and also brings about a data security problem under an open network environment which needs to be solved urgently.
Traditional data security technology uses an encryption mode to protect communication content, but ciphertext is easy to attract attention of an attacker and is damaged or stolen. In contrast to encryption techniques, information hiding techniques embed secret information in an imperceptible manner in a carrier, and the transfer of secret information is achieved through the normal transmission of the carrier in an open communication environment. The information hiding technology hides the existence of secret information communication, so that the information is changed from 'not understood' to 'not seen', the effects of avoiding or paralyzing attackers and avoiding attack or stealing are further achieved, and a new thought is provided for protecting data safety. Since the information hiding technology was proposed in the early 90 s of the last century, the information hiding technology gradually developed and became an important branch of the information security technology, and the information hiding technology has wide application space and great application value in various fields such as national security, military, finance and the like.
The OOXML compound document adopts the OOXML (open Office XML) standard specification. The OOXML standard is a new generation office software document format standard developed by microsoft corporation, is an electronic file specification compressed in a ZIP format based on xml (extensible Markup language), and supports DOCX documents, PPTX slide documents, XLSX electronic form documents, and the like. Office 2007 and higher versions of Office documents are both composite documents formed based on this standard.
The OOXML compound document has good conditions as an information hiding carrier, which are mainly represented as follows:
firstly, the format of the OOXML compound document conforms to the related specifications of a ZIP protocol and an XML format, has potential redundancy and can provide conditions for information hiding.
Secondly, the user group of the OOXML compound document is very huge and widely spread and shared in the existing various communication networks.
The research work of related information hiding carried out by taking an OOXML compound document as a carrier mainly comprises the following steps: document 1(yangj. algorithm of XML document formatting based on equivalent element [ C ]// International Conference on Computer Science & Information technology. ieee, 2010.) combines and arranges XML tags at the same level of a content source file of an OOXML compound document, constructs a correspondence between secret Information and tag combination arrangement, and implements embedding and extraction of the secret Information through a mapping function; document 2 (sunglory-xia. study of textual information hiding technology based on OOXML format [ D ]. hunan: university of long sand science 2015.) embeds secret information by replacing the attribute values of specific modification identifiers in content XML source files; document 3(Park B, Park J. data containment and detection in Microsoft Office 2007 files [ J ]. digital investment, 2009, 5 (3-4): 104-; document 4 (an information hiding method [ C ]// ninth national information hiding and multimedia information security academic congress CIHW2010 discourse collection in li soldiers, wang yan wave, slow sensitivity. Word 2007) based on aliasing is used for screening texts containing secret information contents in advance, and the secret information is highlighted by modifying format attributes in a content source file style.xml; document 5(Fu Z J, Sun X M, Liu Y L, et al. Text split-based hierarchical graphics in OOXML Format for conversion Communication [ J ]. Security and Communication networks.2012, 5 (9): 957-. Document 7 (li soldiers, wang yan wave, slow sensitivity, information hiding method [ J ] based on ZIP document format computer engineering, 2011, 37 (5): 155-.
The researches mainly hide information based on ZIP format, XML label of source file content, reference relationship between source files, source file format attribute and the like, and do not hide information aiming at redundancy brought by position arrangement of OOXML compound document source file data areas; in addition, the work is essentially modified information hiding, namely the OOXML compound document is modified to different degrees, the characteristics of the carrier are easy to change, and the detection attack is difficult to resist.
Based on the method, the information is hidden based on the position arrangement of the source file data area of the OOXML compound document, and the OOXML compound document is not changed at all, so that the method has better concealment and safety and can resist various information hiding detection attacks.
Disclosure of Invention
The invention provides an information hiding method and system based on OOXML composite document source file data area position arrangement sequence, aiming at the problems that the existing related information hiding method which is developed by taking an OOXML composite document as a carrier does not develop information hiding aiming at redundancy brought by OOXML composite document source file data area position arrangement, the OOXML composite document is changed in different degrees, the characteristics of the carrier are easy to change, and detection attack is difficult to resist.
In order to achieve the purpose, the invention adopts the following technical scheme:
an information hiding method based on the position arrangement order of source file data areas of an OOXML compound document comprises the following steps:
step 1: establishing and maintaining an OOXML compound document library C, wherein the OOXML compound document library C is used for storing mapping of secret information and the arrangement sequence of source file data areas of OOXML compound documents and OOXML compound documents conforming to the arrangement sequence of the source file data areas;
step 2: the sender retrieves an OOXML compound document library C according to the secret information, obtains the position arrangement sequence of source file data areas of OOXML compound documents corresponding to mapping, further obtains corresponding OOXML compound documents d, and sends d to the receiver;
and step 3: a receiver obtains an OOXML composite document d, and obtains a source file data area position arrangement order p of the OOXML composite document corresponding to d; and inquiring the OOXML compound document library C according to the p and the d to obtain the mapped secret information.
Further, the OOXML composite document library C further includes link addresses of the OOXML composite documents that conform to the source file data region position arrangement order.
Further, the OOXML compound document library C is shared by the sender and the receiver.
Further, the step 1 comprises:
establishing a form 1 of an OOXML compound document library C, wherein the form 1 is used for storing the relation between secret information and the position arrangement sequence identification of the source file data area of the OOXML compound document;
establishing an OOXML compound document library C form 2, wherein the form 2 is used for storing the position arrangement sequence identifier of the source file data area of the OOXML compound document, the position arrangement sequence of the source file data area of the OOXML compound document and the relationship of the OOXML compound document conforming to the position arrangement sequence of the source file data area;
collecting OOXML compound documents to form an OOXML compound document set F;
calculating the position arrangement order of the source file data areas of each element according to the OOXML compound document Set F, and generating a Set Available _ Positon _ Set consisting of the position arrangement orders of the source file data areas corresponding to the elements in the Set F; simultaneously updating the record of the form 2;
and establishing a single shot from a secret information Set M to an Available _ Positon _ Set, and updating the record of the table 1.
An information hiding system based on the position arrangement order of source file data areas of an OOXML compound document, comprising:
the OOXML compound document library C module is used for establishing and maintaining an OOXML compound document library C, and the OOXML compound document library C is used for storing mapping of the secret information and the position arrangement sequence of a source file data area of an OOXML compound document and storing the OOXML compound document which accords with the position arrangement sequence of the source file data area;
the information hiding module is used for the sender to retrieve the OOXML compound document library C according to the secret information, obtain the position arrangement sequence of the source file data area of the OOXML compound document corresponding to the mapping, further obtain a corresponding OOXML compound document d and send the d to the receiver;
the information extraction module is used for the receiver to obtain an OOXML composite document d and obtain a source file data area position arrangement sequence p of the OOXML composite document corresponding to d; and inquiring the OOXML compound document library C according to the p and the d to obtain the mapped secret information.
Compared with the prior art, the invention has the following beneficial effects:
1) firstly, using information hiding conditions brought by the arrangement sequence of source file data area positions of an OOXML compound document;
2) the content and the display format of the OOXML composite document are not modified, the arrangement sequence of the source file position data area of the transmitted OOXML composite document accords with the source file position sequence of the OOXML composite document which exists in reality, the method has good concealment and safety, and has good resistance to the information hiding detection technology.
Drawings
FIG. 1 is a diagram illustrating source file composition of a DOCX document according to an embodiment of the present invention, wherein the DOCX document is based on a method for hiding information of a location arrangement order of source file data areas of an OOXML composite document;
FIG. 2 is a ZIP file format diagram of an information hiding method based on the position arrangement order of source file data areas of an OOXML composite document according to an embodiment of the present invention;
FIG. 3 is a basic flowchart of an information hiding method based on the OOXML compound document source file data area position arrangement order according to an embodiment of the present invention;
FIG. 4 is a block diagram of an information hiding system according to an embodiment of the present invention, wherein the information hiding system is based on the OOXML compound document source file data region arrangement order.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
example 1
The OOXML compound document describes different data streams in an XML format respectively, wherein most of source files are XML format source files; some non-XML format source files are mainly used for storing OLE objects and pictures in a composite document; still other relational source files are mainly responsible for describing the connection relationship between source files and source files, that is, describing how the source files inside the compound document are connected into a whole. FIG. 1 illustrates an example of the composition of source files of a DOCX document that are merged together in ZIP-compressed form to form a compressed package to form an OOXML compound document. From the outermost layer, the OOXML compound document conforms to the ZIP protocol specification, and is composed of a source file data area, a source file directory area, and a source file directory end flag, as shown in fig. 2. For each source file shown in FIG. 1, there is a particular source file data region corresponding to it in FIG. 2.
These source file names in the OOXML compound document are grouped into a set, denoted as a source file set. The research finds that: (1) different OOXML compound documents may differ in their source file sets. (2) The order of the position arrangement of source file data regions may be different for OOXML compound documents having the same source file set. Based on this, information is represented by the source file data region position arrangement order of the OOXML compound document. Specifically defined:
f: representing a set of OOXML compound documents in an OOXML compound document library C;
m: set of secret information, M ═ Mi|i＝1，2，……, N is a positive integer;
available _ Positon _ Set: and F, a set is formed by arranging the positions of the source file data areas of the OOXML compound documents in sequence.
The method comprises the following steps: and | | Available _ poston _ Set | is more than or equal to N, namely the number of elements in the Set Available _ poston _ Set is more than or equal to the number of elements in the Set M.
As shown in fig. 3, an information hiding method based on the position arrangement order of source file data areas of an OOXML composite document, which is applied in a communication process in which a sender and a receiver cooperate, includes:
step S101: establishing and maintaining an OOXML compound document library C, wherein the OOXML compound document library C is used for storing a single shot of secret information and an OOXML compound document source file data area position arrangement sequence, and a link address corresponding to the OOXML compound document or the OOXML compound document which accords with the source file data area position arrangement sequence, and the database is shared by a sender and a receiver:
(1) establishing an OOXML compound document library C form 1, wherein the form 1 is used for storing the relationship between secret information and OOXML compound document source file data area position arrangement sequence identifiers:
table 1 OOXML compound document library C form 1
| Secret information | Source file data region position arrangement sequence order identification |
(2) Establishing an OOXML compound document library C form 2, wherein the form 2 is used for storing the position arrangement sequence identifier of the source file data area of the OOXML compound document, the position arrangement sequence of the source file data area of the OOXML compound document and the relationship of the OOXML compound document conforming to the position arrangement sequence of the source file data area;
table 2 OOXML compound document library C form 2
(3) Collecting OOXML compound documents or link addresses of the documents, wherein the link addresses are collectively called OOXML compound documents, and the set of OOXML compound documents is represented by F;
(4) according to the F, calculating the position arrangement order of the source file data areas of each element, and generating a Set Available _ Positon _ Set; simultaneously updating the record of the form 2;
(5) establishing a single shot from a secret information Set M to an Available-Positon _ Set, and updating the record of the form 1 according to the single shot;
as an implementation manner, for convenience of description and without loss of generality, it is assumed that the secret information set M is small, and N is 4.
Randomly collecting 9 DOCX documents to form a small-sized OOXML compound document library C, wherein a DOCX document set F in the DOCX document library C is {1.DOCX, 2.DOCX, 3.DOCX, 4.DOCX, 5.DOCX, 6.DOCX, 7.DOCX, 8.DOCX, 9.DOCX };
analyzing the position arrangement order of the source file data areas of each DOCX document in the F according to the ZIP format to obtain: available _ Positon _ Set ═ pi1, 2, ·, 5 }; table 2 shown in table 2 is updated to obtain table 3.
TABLE 3 Source File data location ranked List of DOCX documents in the example OOXML Compound document library C
Establishing a single shot of M and Available _ Positon _ Set, that is, for 4 secret information in M, selecting 4 elements from the Set Available _ Positon _ Set to establish correspondence with the secret information, wherein the selection strategy is sequential selection, and generating records as shown in Table 4.
TABLE 4 example of correspondence of secret information to OOXML Compound document Source File region position arrangement order
| Secret information | Source file data region position arrangement order identification |
| m1 | p1 |
| m2 | p2 |
| m3 | p3 |
| m4 | p4 |
It is worth mentioning that:
(1) the set M, the set F, the table 3 and the table 4 are all in an OOXML compound document library C;
(2) in an actual system, an OOXML compound document library can be established according to actual requirements, for example, the size of a secret information set and the like, and the library can also include PPTX, XLSX and other type compound documents.
Step S102: the sender searches an OOXML compound document library C according to the secret information, acquires an OOXML compound document corresponding to mapping (or a link address corresponding to the OOXML compound document), if a plurality of OOXML compound documents exist, selects one OOXML compound document according to a certain rule, marks the selected OOXML compound document as d, and sends the d to the receiver;
assume that the secret information is m2Then, m is shown in tables 3 and 42The corresponding source file order is p2Is in line with p2The DOCX documents are 3.DOCX and 9.DOCX, and the compound document can be selected according to a certain policy (such as small document priority or random selection, etc.), wherein the random selection is performedIs 9. docx. The sender sends out 9.docx over the open channel.
It should be noted that the docx document information shown in table 3 may be an actual docx document, or information such as a link address of the document; therefore, the document may be transmitted directly or link address information of the document may be transmitted. Regardless of the information, the objective is to allow the recipient to retrieve the document.
Step S103: a receiver obtains an OOXML composite document d, and obtains a source file data area position arrangement order p of the OOXML composite document corresponding to d; inquiring an OOXML compound document library C according to the p and the d to obtain mapped secret information;
as an implementable manner, in this embodiment, the receiving party obtains 9.docx, and by reading the format of the document, the position arrangement order of the source file data area corresponding to the document, that is, p in table 2, can be obtained2A sequence of the identifier; receiver basis 9.docx and p2Looking up tables 3 and 4, the secret information m can be obtained2。
Example 2
As shown in FIG. 4, an information hiding system based on the OOXML compound document source file data area position arrangement order comprises:
the OOXML compound document library C module is used for establishing and maintaining an OOXML compound document library C, and the OOXML compound document library C is used for storing mapping of the secret information and the position arrangement sequence of a source file data area of an OOXML compound document and storing the OOXML compound document which accords with the position arrangement sequence of the source file data area;
the information hiding module is used for the sender to retrieve the OOXML compound document library C according to the secret information, obtain the position arrangement sequence of the source file data area of the OOXML compound document corresponding to the mapping, further obtain a corresponding OOXML compound document d and send the d to the receiver;
the information extraction module is used for the receiver to obtain an OOXML composite document d and obtain a source file data area position arrangement sequence p of the OOXML composite document corresponding to d; and inquiring the OOXML compound document library C according to the p and the d to obtain the mapped secret information.
The above shows only the preferred embodiments of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.
Claims (5)
1. An information hiding method based on the position arrangement order of source file data areas of an OOXML compound document is characterized by comprising the following steps:
step 1: establishing and maintaining an OOXML compound document library C, wherein the OOXML compound document library C is used for storing mapping of secret information and the arrangement sequence of source file data areas of OOXML compound documents and OOXML compound documents conforming to the arrangement sequence of the source file data areas;
step 2: the sender retrieves an OOXML compound document library C according to the secret information, obtains the position arrangement sequence of source file data areas of OOXML compound documents corresponding to mapping, further obtains corresponding OOXML compound documents d, and sends d to the receiver;
and step 3: a receiver obtains an OOXML composite document d, and obtains a source file data area position arrangement order p of the OOXML composite document corresponding to d; and inquiring the OOXML compound document library C according to the p and the d to obtain the mapped secret information.
2. The method of claim 1, wherein the OOXML composite document library C further comprises link addresses of OOXML composite documents conforming to the source file data region position arrangement order.
3. The method of claim 1, wherein said OOXML composite document library C is shared by a sender and a receiver.
4. The method of claim 1, wherein the step 1 comprises:
establishing a form 1 of an OOXML compound document library C, wherein the form 1 is used for storing the relation between secret information and the position arrangement sequence identification of the source file data area of the OOXML compound document;
establishing an OOXML compound document library C form 2, wherein the form 2 is used for storing the position arrangement sequence identifier of the source file data area of the OOXML compound document, the position arrangement sequence of the source file data area of the OOXML compound document and the relationship of the OOXML compound document conforming to the position arrangement sequence of the source file data area;
collecting OOXML compound documents to form an OOXML compound document set F;
calculating the position arrangement order of the source file data areas of each element according to the OOXML compound document Set F, and generating a Set Available _ Positon _ Set consisting of the position arrangement orders of the source file data areas corresponding to the elements in the Set F; simultaneously updating the record of the form 2;
and establishing a single shot from a secret information Set M to an Available _ Positon _ Set, and updating the record of the table 1.
5. An information hiding system based on the position arrangement order of source file data areas of an OOXML compound document, comprising:
the OOXML compound document library C module is used for establishing and maintaining an OOXML compound document library C, and the OOXML compound document library C is used for storing mapping of the secret information and the position arrangement sequence of a source file data area of an OOXML compound document and storing the OOXML compound document which accords with the position arrangement sequence of the source file data area;
the information hiding module is used for the sender to retrieve the OOXML compound document library C according to the secret information, obtain the position arrangement sequence of the source file data area of the OOXML compound document corresponding to the mapping, further obtain a corresponding OOXML compound document d and send the d to the receiver;
the information extraction module is used for the receiver to obtain an OOXML composite document d and obtain a source file data area position arrangement sequence p of the OOXML composite document corresponding to d; and inquiring the OOXML compound document library C according to the p and the d to obtain the mapped secret information.
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