46 results about "Hidden text" patented technology

The invention discloses a text hidden method based on Chinese sentence pattern template transformation. The method utilizes the computer system to carry out watermark embedment and extraction on textinformation to hide the text information, comprising the following steps: (1) carrying out pre-treatment on an electronic file; (2) generating watermark information sign and setting a key; (3) carrying out part-of-speech tagging to format-free file generated in step (1) by a part-of-speech tagging module and outputting a part-of-speech tagging string of a sentence; (4) simplifying the part-of-speech tagging string output in the step (3) by a chunk tagging module; (5) loading a template module to select a sentence pattern module; (6) embedding watermark information by a watermark embedment module; (7) outputting the hidden text with embedded watermark; and (8) extracting the watermark information from the hidden text by a watermark extraction module through the key. The text hidden method changes sentence pattern through a template, avoids complex understanding and processing of grammar and semanteme, ensures the carrier text better satisfying grammar and semanteme habit and prevents blindfold rewrite.

A system detects hidden elements in a document that includes a group of elements. The system may identify each of the elements in the document and create a structural representation of the document. The structural representation may provide an interconnection of the group of elements in the document. The system may also determine whether one or more elements of the group of elements are hidden based at least in part on locations or other attributes or properties of the one or more elements in the structural representation.

The invention relates to a text steganographic (secret writing) method with a misguiding function. The method comprises the steps of: opening a file, reading contents of the file, then replacing a keyword in the file with a keyword close, opposite or similar to the keyword in the file, and finally storing the file so that the misguiding function is achieved. The replacement of the keyword is achieved by adopting the combination of the fixed replacement and the floating replacement. The floating replacement is controlled by a secret key, a safe sequence generated by the secret key is used for carrying out tentative replacement, and if the replacement is not right, correction information can be added behind the secret key. Contents of the text subjected to steganography are possibly close, opposite or similar to contents of a hidden text, thus the misguiding effect can be obtained. The steganographic method is free of the defect that the traditional steganographic method needs large files of images, videos, audios and the like, and can directly misguide an opposite party.

The invention discloses a steganography evaluation based steganalysis method. The steganography evaluation based steganalysis method comprises the steps of: (1) establishing a reference feature set containing a plurality of steganographic features; (2) performing steganography on a group of original text {Xi} by adopting a to-be-analyzed steganographic algorithm to generate a corresponding group of hidden text {Yi}; (3) selecting partial features in the reference feature set as inspecting features, calculating a inspecting feature vector of each sample in both the original text set and the hidden text set to respectively obtain feature vector sets {xi} and {yi} of both the original text set and the hidden text set; (4) evaluating effectiveness of each component of each inspecting feature vector serving as each hidden writing feature based on {xi} and {yi}; (5) repeating steps (3) and (4) for multiple times to obtain an effectiveness evaluation result of a group of feature vector components; and (6) selecting a plurality of components from an effectiveness evaluation result to build a new feature vector, performing redundancy elimination to obtain feature vectors of the steganographic algorithm for the steganalysis on the to-be-analyzed steganographic algorithm, and detecting if the to-be-analyzed steganographic algorithm contains hidden information. The steganography evaluation based steganalysis method, disclosed by the invention, has the advantage of greatly improving realization efficiency of steganalysis.

Systems including hardware and computer software and methods can create a text-searchable data structure that includes electronic image documents. The system may be configured in modules. The system converts an electronic image document into a visually optimized electronic image document and into a detail optimized electronic image document. The system also includes an OCR engine that abstracts character information from the detail optimized electronic image document and writes the character information into a text file. The visually optimized electronic image document is linked with the text file in a data structure by the system. The resulting data structure, which may be an image over hidden text pdf document, may be searched using various text based search techniques. When specified text is located in a text file, the corresponding visually optimized electronic image document may then be presented to the searcher.

The invention provides a character recognition device and method, an image display device, and an image retrieval device. According to an embodiment, the character recognition device includes a detector, first and second recognizers, an estimator, a second recognizer, and an output unit. The detector is configured to detect a visible text area including a visible character from an image. The first recognizer is configured to perform character pattern recognition on the visible text area, and calculate a recognition cost according to a likelihood of a character pattern. The estimator is configured to estimate a partially-hidden text area into which a hidden text area estimated to have a hidden character and the visible text area are integrated. The second recognizer is configured to calculate an integrated cost into which the calculated cost and a linguistic cost corresponding to a linguistic likelihood of a text that fits in the entire partially-hidden text area are integrated. The output unit is configured to output a text selected or ranked based on the integrated cost.

The invention relates to a multi-media comprehensive steganalysis method based on a window-type hypothesis test, comprising the steps of: S1 preparing an original text set and a steganographic set, and dividing a training set and a verification set; S2 extracting features from the training set, and training to obtain a predictor; S3 puts the verification set into the predictor to get the output, fits the probability distribution model according to the output, and uses the output to estimate the parameters of the selected model; S41 samples the test set according to different window sizes; S42 according to the probability selected in step S3 Distribution model and parameters to obtain the null hypothesis and alternative hypothesis of hypothesis testing; S43 determines the judgment conditions of hypothesis testing according to the false alarm rate and missed detection rate specified by the user, combined with the sampling scale of the window, and performs statistical inference and window type hypothesis testing ; S5 conducts comprehensive analysis and decision-making on the results of the window hypothesis test. The invention can detect and determine whether steganographic information is contained in samples, reduce the false alarm rate and missed detection rate of comprehensive steganographic analysis, and improve the operation speed of steganographic analysis.

The embodiment of the invention provides a text information hiding method and device, electronic equipment and a storage medium. The method comprises the steps of inserting a to-be-hidden text into any one of M+1 positions determined by M second characters in a preset random character set to obtain M+1 text character strings; for each text character string, exchanging the position of each character in the text character string with other characters, and for each character, calculating the difference value between the character distance between the characters before and after the character exchange position and the character distance of the corresponding characters in the to-be-hidden text; for each character of each text character string, according to the difference value between the character distance between the characters before and after the character exchange position and the character distance of the corresponding characters in the to-be-hidden text, conducting calculating to obtain the comprehensive difference value of different text character sets obtained before and after the character exchange position; and taking one or more of the text character sets corresponding to the comprehensive difference values meeting the preset requirements as a target character set.

The invention discloses a novel Shannon's perfect secrecy method, which belongs to the field of information technology and includes the following steps: Step 1: determine the basic alphabet according to the information to be transmitted, and combine to form information plaintext; Step 2: encode the alphabet to obtain numbers plaintext; step 3: group the digital plaintext with a certain fixed length in order; step 4: encrypt each group of digital plaintext to obtain the plaintext and hidden text of the new group; step 5: use the permutation relationship to generate the hidden text key, Encrypt to obtain the information ciphertext; Step 6: Encrypt the cryptography key to obtain the key ciphertext; Step 7: Information transmission; Step 8: The receiver uses the seed key received by the secure channel to calculate all cryptography keys, and uses the cryptography The text key decrypts the ciphertext of the information to obtain the plaintext and hidden text; Step 9: Calculate the plaintext corresponding to the plaintext and hidden text. The encryption and decryption of the present invention are linear time, so that Shannon's perfect secrecy concept can be applied to the secure transmission of large-scale plaintext.

The invention discloses a method for matching a simulation grating based on a hidden image lattice point area ratio. The method comprises the specific steps that a master print map is manufactured; a hidden text or image is manufactured on the manufactured master print map; a matching relation between the hidden image lattice point area ratio and a simulation matching grating area ratio is established according to hidden text or image parameters; a simulation matching grating is manufactured according to the established matching relation; the manufactured simulation matching grating is placed on the master print map to detect hidden information. According to the method for matching the simulation grating based on the hidden image lattice point area ratio, the precise matching relation between the hidden image lattice point area ratio and the simulation matching grating area parameters is obtained according to the matching algorithm between the hidden image lattice point area ratio and the simulation matching grating area parameters, the better showing effect after the simulation matching grating is added into a hidden image is achieved, the problems that according to an existing method, the matching degree of the hidden image and the simulation matching grating is not high, and the showing effect of the hidden image is not good are solved, the computing method is simple, and operation is convenient.

The invention discloses a text hidden method based on Chinese sentence pattern template transformation. The method utilizes the computer system to carry out watermark embedment and extraction on text information to hide the text information, comprising the following steps: (1) carrying out pre-treatment on an electronic file; (2) generating watermark information sign and setting a key; (3) carrying out part-of-speech tagging to format-free file generated in step (1) by a part-of-speech tagging module and outputting a part-of-speech tagging string of a sentence; (4) simplifying the part-of-speech tagging string output in the step (3) by a chunk tagging module; (5) loading a template module to select a sentence pattern module; (6) embedding watermark information by a watermark embedment module; (7) outputting the hidden text with embedded watermark; and (8) extracting the watermark information from the hidden text by a watermark extraction module through the key. The text hidden method changes sentence pattern through a template, avoids complex understanding and processing of grammar and semanteme, ensures the carrier text better satisfying grammar and semanteme habit and prevents blindfold rewrite.

The invention discloses a text steganography method based on a generative confrontation network. The model regards text steganography as a text sequence generation process, and effectively steganographically secrets text in the generated text through a key mapping table, while ensuring In order to generate high-quality text, the policy gradient optimization generator is used in the adversarial training, and finally the generative model can generate high-quality steganographic text. Compared with traditional training methods, the adversarial learning process can make the model better simulate Combine the distribution of the entire corpus to generate more reasonable phrase collocations and long texts.

The invention provides a text information hiding method, which includes: acquiring an original font file used by to-be-hidden text information, generating a new font file by rectifying mapping relation between font index and character codes in the original font file; rectifying the text information according to the new font file, writing the rectified text information into an electronic document; acquiring font description data of characters in the text information from the new font file when the electronic document is opened, and displaying the text information according to the acquired description data. Correspondingly, the invention further provides a text information hiding device, character codes of the text information cannot be changed and any encryption method is omitted, effect of hiding the text information can be realized simply, and safety, hiding performance and robustness are high.

A flexible packaging bag with a concealable information pattern, comprising a bag body, the bag body has at least one stretchable hem structure, one end of the stretchable hem structure of the bag body has a sealing edge, and the outer edge of the hem structure The surface is printed with a concealable information pattern, and after the bag body is filled with materials, the folded edge structure forms a pit close to the edge seal, and the concealable information pattern is located on the inner side wall of the pit. A method for hiding graphic and text information on the surface of a flexible packaging bag. An edge sealing is provided at one end of a stretchable hemming structure of the flexible packaging bag, so that after the flexible packaging bag is filled with materials, the above-mentioned hemming structure is close to the edge sealing area A concave triangular conical pit is formed, and a concealable information pattern is arranged on the inner wall of the triangular conical pit, so that the concealable information pattern cannot be recognized by human eyes or mobile phones. A method of hiding graphic information. The invention can effectively ensure that the concealable information pattern can only be used after being sold.

The beep pager possesses the coded hidden text of the handset codes. The hidden texi is obtained by executing the routine for compiling the handset codes of the beep pager with at least one key valuebeing used. With the information having additional handset codes being received, the beep pager executes the routine for decoding the hidden text of handsets with at least one key valiue so as to generate the handset codes, which is compared to the handset codes in the received information which is processed only both of codes are consistent.

The invention discloses a method for securely detecting hidden text information based on a homomorphic encryption system, and the method is used for a service provider to detect the hidden text information of a service user. The method comprises the following steps: the service provider and the service user which are mutually independent transfer non-private information interactively so as to complete the detection on the hidden text information; and then, according to the comparand of the service provider and the service user, the two parties judge whether the text information contains hidden information by utilizing the homomorphic encryption system and an executive safety comparison protocol. By using the method, the detection on the hidden text information can be performed between twoindependent parties which are lack of mutual trust.

The invention discloses a method of identifying hidden characters and patterns by a moire phenomenon. In order to solve the improper design of the key to questions of existing textbooks and books and reduce interference on thinking to reading caused by the key, according to the method, characters and patterns and the background are screened by a same way and are distributed in a staggered manner, and the characters and patterns are hidden under high resolution screen line numbers; an identification card is manufactured by selecting proper material and printing mode, and the screening mode of the identification card is as same as that of the hidden region, so that the identification card and the hidden region are superposed to generate moire interference, and therefore, reverse interference is generated for the characters and patterns and the background, thereby increasing the difference of the two, and identifying information of the characters and patterns. The method is simple and understandable, convenient to set type and print and simple in verification operation, and the user can enjoy the pleasure of reading in a process of verifying the key.