Abstract: Methods for realizing the CAPTCHA with 3D models and device thereof comprises following steps: (1) randomly selecting a 3D model from a model repository as an original model; generating two sets of random transformations; (2) applying the target transformations to the original model to generate a target model; generating a target image from rendering the target model; (3) applying the initial transformations to the original model to generate an operating model; displaying the operating model and the target image in two regions in client; (4) changing the property of the operating model through user interactive operation until the state of the operating model is consistent with the target image; generating a final transformations from the initial transformations by means of user interactive operation; (5) comparing the target transformations with the final transformations. It leverages the advantage of perception of 3D space in human beings.

Abstract: Methods for realizing the CAPTCHA with 3D models and device thereof comprises following steps: (1) randomly selecting a 3D model from a model repository as an original model; generating two sets of random transformations; (2) applying the target transformations to the original model to generate a target model; generating a target image from rendering the target model; (3) applying the initial transformations to the original model to generate an operating model; displaying the operating model and the target image in two regions in client; (4) changing the property of the operating model through user interactive operation until the state of the operating model is consistent with the target image; generating a final transformations from the initial transformations by means of user interactive operation; (5) comparing the target transformations with the final transformations. It leverages the advantage of perception of 3D space in human beings.

Abstract: Difference data is generated between a reference file and a target file that are orderly dependent having common blocks that appear in the same order in both the reference and target files. The difference data is generated by comparing hash values of chunks of the reference file against hash values of parts of the target file to identity copy operations between the reference and target files. Chunks of the reference file and parts of the target file are loaded into main memory to create hashes for comparison and unloaded from the main memory after exhaustion. The difference data is included in a difference file, which is provided to one or more endpoint computers. In an endpoint computer, the target file is reconstructed using a copy of the reference file and the difference data from the difference file.

Abstract: Detection of an encryption or compression application program may be based on similarity between read files read by a process of the application program and write files written by the process. Read fingerprints of the read files and write fingerprints of the write files are generated. A listing of the read fingerprints is searched for presence of matching write fingerprints to find matched fingerprints. The similarity is calculated based on the read fingerprints and matched fingerprints.

Abstract: One embodiment relates to a computer-implemented method for generating difference data between reference and target files. A difference engine performs a first procedure to generate difference data representing the difference between the reference and target files if the reference and target files are sequences of sorted data records. The first procedure may compare a lexical order of a record from the reference file against a lexical order of a record from the target file. An entry may be added to a copy list if the records are the same, and an entry may be added to an add list if that the record from the reference file is lexically greater than the record from the target file. Another embodiment relates to an apparatus for generating difference data.

Abstract: One embodiment relates to a computer-implemented method for multiple-keyword matching performed using a computer including at least a processor, data storage, and computer-readable instructions. A keyword set and a text input to be searched are obtained. The keyword set is processed to create a reverse trie. A search procedure which starts from the end of the text is then applied using the reverse trie to find keyword occurrences in the text input. Other embodiments, aspects, and features are also disclosed.

Abstract: One embodiment relates to a computer-implemented method for multiple-keyword matching performed using a computer including at least a processor, data storage, and computer-readable instructions. A keyword set and a text string to be searched are obtained. A suffix sorting procedure is applied to the text string to create a suffix index array. A dual binary keyword search procedure is applied to a reference list of suffix strings presented by the suffix index array. The dual binary keyword search procedure may apply a recursive function that utilizes a divide-and-conquer process and may have inputs of a results list, the suffix index array, and the keyword set. The recursive function may add a range of items to the results list if a keyword is determined to be a prefix of a suffix string in the reference list. Other embodiments, aspects, and features are also disclosed.

Abstract: One embodiment relates to a computer-implemented process for generating document fingerprints. A document is normalized to create a normalized text string. A first hash function with a sliding hash window is applied to the normalized text string to generate an array of hash values. Candidate anchoring points are selected by applying a first filter to the array of hash values. The anchoring points are chosen by applying a second filter to the candidate anchoring points. Finally, a second hash function is applied to substrings located at the chosen anchoring points to generate hash values for use as fingerprints for the document. Other embodiments and aspects are also disclosed.