CN109582645B

CN109582645B - Anti-cheating system for paperless examination

Info

Publication number: CN109582645B
Application number: CN201811534590.0A
Authority: CN
Inventors: 樊兆恩; 董醒儒; 段娟; 肖创柏
Original assignee: Beijing University of Technology
Current assignee: Beijing University of Technology
Priority date: 2018-12-14
Filing date: 2018-12-14
Publication date: 2021-03-16
Anticipated expiration: 2038-12-14
Also published as: CN109582645A

Abstract

The invention discloses a paperless examination anti-cheating system, which consists of an examination machine module, a teacher machine module and a supervisor module. The examination machine module has screen recording, file uploading, application checking and anti-cheating functions; the teacher computer module has the functions of starting recording, stopping recording, storing video and searching video; the management machine module has the functions of video searching, video downloading, video playing, log analysis and the like. After the examinee logs in the examination system, the anti-cheating system starts to record the screen of the examinee and records the operation of the examinee on the examination machine. After the examination is finished, whether the examinee is suspected to cheat or not can be determined by analyzing the log file of the examinee, and if yes, whether the examinee has the cheating behavior or not can be checked by replaying examination videos, so that the cheating behavior in the examination can be prevented.

Description

Anti-cheating system for paperless examination

Technical Field

The invention relates to the Internet industry, in particular to a paperless examination anti-cheating system.

Background

The examination has a long history, and the examination continues for more than a thousand years since the institute of science and technology of sui and Tang dynasty, and the examination continues to be used as an important reference for selecting talents in China or enterprises. Before the internet appeared, examinations were in a paper form, teachers designed test papers, students answered on the test papers with paper and pens, then the teachers changed the test papers to obtain scores of each subject, then total scores of each student were summed up, and finally students in each class were manually ordered. Such steps are cumbersome, consume significant manpower and material resources, and may result in a situation where the total score is erroneous. After each examination, the students can see their scores for a long time, and the teacher is also labourious and labouring during the period, which is very inefficient. With the development of internet technology, the internet has gradually advanced into the education industry, and in the 70 s of the 20 th century, the american examination council initiated the research work of computer-simulated examinations and worked out an effective simulated examination system in 1983, which was named as a computer-aided examination system. In 1990, 8 months, ten states such as California, Texas, United states created academic certificates and corresponding teaching systems that were mutually approved by each state and each college, thereby formally opening the preface of network remote examinations. With the development of scientific technology, especially computer network technology and database technology, the web paperless examination system has become an authentication form commonly used internationally due to its flexibility, scientificity, fairness, and high efficiency. There are 2200 examination centers in 140 countries and regions in 6 continents of the world, which can provide hundreds of different types, one thousand of examinations, and many popular examination examinations including microsoft expert authentication in computer class and GRETOEFL in foreign language. In 2011, more than 400 million people participate in computerized examinations worldwide each year. The paperless examination mode is applied to paperless examinations of China, such as computer-level examinations, Mandarin examinations, examination retests, many professional examinations and the like, and the rapid development tendency is presented, but because the cheating conditions are infinite in layer number, the cheating means is higher and higher, the development tendency of the paperless examinations is slowed down, and the transition process from the traditional examinations to the paperless examinations is hindered. The general paperless examination has three common modes, wherein a single-machine mode, a C/S mode and a B/S mode are provided in the literature and are commonly used. The B/S mode obtained by comparing the three modes is optimal in all indexes, so that the B/S mode is the optimal and preferred mode in the existing paperless examination system, and students can perform online examinations through a browser without installing any program. The paperless examination mode is very flexible, and teachers can randomly distribute questions through a design question bank and a paperless examination system, so that the possibility of mutual cheating of adjacent examinees is reduced, and the examinees have different questions. Moreover, the difficulty of the questions can be well designed, and each examinee can obtain different questions with similar difficulty coefficients by setting the difficulty coefficient of each question; the paperless examination system can help teachers correct objective questions and give suggested scores of subjective questions, time and pressure of teachers correcting test papers are greatly reduced, and the paperless examination system can help teachers to sum up scores and rank according to total scores, so that efficiency is improved, and error rate is reduced.

From ancient times to present, cheating is always accompanied by examinations for more than one thousand years, no matter which form of examinations, cheating phenomena can occur, and the cheating case of an ancient science taking an examination is also a visual and frightening effect. Therefore, how to prevent cheating has been a focus of research in the field of education. With the development of the paperless examination method, the paperless examination will certainly be popularized in the future, and therefore, how to prevent cheating on the paperless examination becomes a key research object in the field of education. Generally, a paperless examination system reduces the possibility of transferring answers in a mode that the questions of adjacent examinees are different, but network cheating, computer-aided cheating and the like caused by paperless examination are not well solved. At present, the existing anti-cheating technologies comprise an API calling technology, a registry technology, an interception message technology, a callback technology, a hook technology and the like, and the existing anti-cheating technologies play a certain anti-cheating role, but can not completely stop cheating and can not obtain cheating evidences, so that the interfaces of a teacher machine and a supervisor are designed in a mode based on Qt + ffmpeg + SDL, the functions of screen recording of an examination machine, video playback of the supervisor and the like can be performed, examination information acquisition is realized, the problem-making process of students with problems can be conveniently played back, and cheating investigation is realized.

Disclosure of Invention

In view of the above, the present invention provides a system for preventing cheating on paperless examinations by screen recording, so as to collect cheating evidences on paperless examinations.

In order to achieve the above object, an embodiment of the present invention provides the following solutions:

a paperless examination anti-cheating system comprises three modules: the examination machine module, the teacher machine module and the management machine module are connected in parallel.

The examination machine module comprises a screen recording module, a log generation module, a video file uploading module, a log file uploading module, other application use checking module and an anti-cheating module.

Screen recording: intercepting the screen of the examination machine at least 15 frames per second, recording the complete examination process of the examination, performing video compression coding by adopting an ffmpeg technology according to the H.264 video compression decoding standard to generate a video file in an mp4 format, temporarily storing the video file in the local of the examination machine module, adding four attributes of read-only, hiding, systematic and storing to the video file, and preventing the video file from being modified or deleted.

Generating a log: in the examination process, files or applications used by an examinee can be recorded into corresponding log files, corresponding attributes of the log files are changed into read-only, hidden, systematic and stored, and the log files are prevented from being modified.

Uploading a video file: the breakpoint continuous transmission of the video files of the examination machine is realized by using a curl technology, the video files are uploaded to a corresponding directory of an FTP server built in a corresponding teacher machine, the video files in the local examination machine module are deleted, and the space occupation is reduced.

Uploading a log file: and (3) realizing breakpoint continuous transmission of the log file of the test machine module by using a curl technology, uploading the log file to a corresponding FTP directory of the management machine, and deleting the log file on the test machine module.

Other applications use checks: and detecting other applications started in the test process of the examinee by using QPprocess technology in the Qt, detecting whether the application is allowed to be used or not, forcibly turning off the application if the application is not allowed, and recording corresponding logs.

And (3) cheating prevention: by using a series of anti-cheating measures such as API calling technology, registry technology, message interception technology, callback technology, hook technology and the like, the use of hot keys is prevented, the file sharing among examinees is prevented, the examinees are prevented from searching answers through a network, and the use of external storage equipment can also be prevented.

The teacher computer module has the functions of starting the video recording state of the examination machine, stopping the video recording state of the examination machine, setting available file formats, storing video files of the examination machine, searching the video files and the like.

Starting a video recording state of the examination machine: when the examination starts, the invigilator clicks all the examination machines to start recording, so that all the examination machines in the examination room start recording videos and do corresponding recording work.

Stopping the video recording state of the examination machine: after the examination is finished, all clicks are stopped, the recording of all the videos of the examination machines can be finished, corresponding video files are generated, and the videos are automatically uploaded to corresponding directories of the FTP server of the teacher machine.

Setting available file formats: the teacher module sets the format of the file which can be used by the examination machine according to the requirement of the examination content, so that the situation that the examinee uses the file which does not accord with the examination content is avoided.

Video file storage: and (4) building an FTP server on the teacher machine, uploading the video file of the examination machine to the teacher machine for storage after the examination is finished, and uploading the log file to the management machine.

Searching a video file: and the teacher computer module searches video files meeting the conditions by selecting the number of the examinee and the number of the examination machine.

The supervisor module comprises a video file searching module, a video file downloading module, a video file playing module and an examination record analyzing module.

Searching for a video file: the video file stored in the FTP server on the teacher's computer can be searched by selecting the number of the teacher's computer and the number of the examinee, and the path of the video file is displayed.

Downloading a video file: and downloading the searched video file to a local folder of the management machine by double-clicking the path of the searched video file.

Playing the video file: playing the video files downloaded to the local by means of ffmpeg + SDL, and providing fast forward and fast backward functions, and also having the function of video double playing or slow playing.

Analyzing the examination record: the method comprises the steps of analyzing examination record files through a big data technology, analyzing abnormal conditions in each examination record file through comparison of each examination record file, generating suspicious files, searching corresponding videos through the files by teachers, and watching whether the examinees cheat or not.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a functional configuration diagram of a paperless examination anti-cheating system;

fig. 2 is a flowchart of a paperless examination anti-cheating system according to an embodiment of the present invention;

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

When the system is implemented, corresponding application programs are installed on all the examination machines, the teacher machine and the management machine.

As shown in fig. 1, a paperless examination anti-cheating system is composed of an examination machine module, a teacher machine module and a supervisor machine module. The examination machine module has the functions of screen recording, file uploading, application checking, cheat prevention and the like; the teacher computer module has the functions of starting recording, stopping recording, storing video, searching video and the like; the management machine module has the functions of video searching, video downloading, video playing, log analysis and the like.

Referring to fig. 2, the implementation method of the system includes the following steps:

and step S1, the examinees log in the examination system to start examination, and simultaneously, the teacher machine starts the paperless examination anti-cheating systems on all the examination machines to monitor the examination conditions of the students.

And step S2, during the examination, recording the answer screen of the examinee, and recording the operation of the examinee on the application program and the file on the examination machine in the examination process, so as to prevent the examinee from opening the file prepared in advance to cheat. Meanwhile, a series of anti-cheating measures such as API calling technology, registry technology, message interception technology, callback technology and hook technology are adopted to prevent the use of hot keys, prevent file sharing among examinees, prevent the examinees from searching answers through a network and prevent the use of external storage equipment.

And step S3, after the examination is finished, the examination machine generates a video file in an mp4 format, uploads the video file to a corresponding directory of an FTP server of a corresponding teacher machine, and uploads a log file to a corresponding folder of the supervisor.

And step S4, analyzing the log file through a Hadoop technology, checking abnormal behaviors of the examinee, and if the examinee opens an unallowed application program or file, generating a corresponding record and storing the record in the abnormal file.

Step S5, the teacher or the examination manager checks the abnormal file, if the examinee has abnormal behavior, the video file of the examinee examination machine is searched and downloaded to the local of the management machine, finally the video file is played, the position of the corresponding abnormal occurrence time is adjusted through the progress bar, whether the examinee has cheating behavior or not is checked, and if the cheating behavior exists, the examination score of the examinee is cancelled.

Claims

1. The utility model provides a system of practising fraud is prevented in paperless examination which characterized in that: the system comprises three modules: the examination machine module, the teacher machine module and the management machine module are connected in parallel;

the examination machine module comprises screen recording, log generation, video file uploading, log file uploading, other application use checking and anti-cheating functions;

screen recording: intercepting a screen of the examination machine at least 15 frames per second, recording the complete examination process of the examination, performing video compression coding by adopting an ffmpeg technology according to the video compression decoding standard of H.264, generating a video file in an mp4 format, temporarily storing the video file in the local of an examination machine module, adding four attributes of read-only, hiding, systematic and storing to the video file, and preventing the video file from being modified or deleted;

generating a log: in the examination process, files or applications used by an examinee can be recorded into corresponding log files, corresponding attributes of the log files are changed into read-only, hidden, systematic and stored, and the log files are prevented from being modified;

uploading a video file: the breakpoint continuous transmission of the video files of the examination machine is realized by using a curl technology, the video files are uploaded to a corresponding directory of an FTP server built in a corresponding teacher machine, the video files in the local of the examination machine module are deleted, and the space occupation is reduced;

uploading a log file: using a curl technology to realize breakpoint continuous transmission of the log file of the examination machine module, uploading the log file to a corresponding FTP directory of a management machine, and deleting the log file on the examination machine module;

other applications use checks: detecting other applications started in the examination process of the examinee by using a QPprocesses technology in the Qt, detecting whether the application is allowed to be used or not, forcibly turning off the application if the application is not allowed, and recording corresponding logs;

and (3) cheating prevention: a series of anti-cheating measures including an API calling technology, a registry technology, an interception message technology, a callback technology and a hook technology are used for preventing the use of hot keys, preventing the sharing of files among examinees, preventing the examinees from searching answers through a network and preventing the use of external storage equipment;

the teacher computer module has the functions of starting the video recording state of the examination machine, stopping the video recording state of the examination machine, setting an available file format, storing video files of the examination machine and searching the video files;

starting a video recording state of the examination machine: when the examination starts, the invigilator clicks all the examination machines to start recording, so that all the examination machines in the examination room start recording videos and do corresponding recording work;

stopping the video recording state of the examination machine: after the examination is finished, clicking all the examination machines to stop, finishing the recording of all the examination machine videos, generating corresponding video files, and realizing the automatic uploading of the videos to corresponding directories of the FTP server of the teacher machine;

setting available file formats: the teacher machine module sets the format of the file which can be used by the examination machine according to the requirement of the examination content, so that the situation that the examinee uses the file which does not accord with the examination content is avoided;

video file storage: building an FTP server in a teacher machine, uploading a video file of an examination machine to the teacher machine for storage after an examination is finished, and uploading a log file to a management machine;

searching a video file: the teacher computer module searches video files meeting the conditions by selecting the number of the examinee and the number of the examination machine;

the supervisor module comprises functions of searching video files, downloading the video files, playing the video files and analyzing examination records;

searching for a video file: video files stored in an FTP server on a teacher computer can be searched by selecting the number of the teacher computer and the number of an examinee, and the path of the video files is displayed;

downloading a video file: downloading the searched video file to a local folder of the management machine by double-clicking the searched path of the video file;

playing the video file: playing and downloading the video files to the local in a way of ffmpeg + SDL, providing fast forward and fast backward functions and having the function of double playing or slow playing of videos;

2. A method for implementing a paperless examination anti-cheating system using the system of claim 1, comprising: the implementation method comprises the following steps:

step S1, the examinee logs in the examination system to start examination, and meanwhile, the teacher starts the paperless examination anti-cheating systems on all the examination machines to monitor examination conditions of the students;

step S2, during the examination, recording the answer screen of the examinee, and recording the operation of the examinee on the application program and the file on the examination machine in the examination process, so as to prevent the examinee from opening the file prepared in advance to cheat; meanwhile, a series of anti-cheating measures such as API calling technology, registry technology, message interception technology, callback technology and hook technology are adopted to prevent the use of hot keys, prevent the file sharing among examinees, prevent the examinees from searching answers through a network and also prevent the use of external storage equipment;

step S3, after the examination is finished, the examination machine generates a video file in an mp4 format, uploads the video file to a corresponding directory of an FTP server of a corresponding teacher machine, and uploads a log file to a corresponding folder of the supervisor;

step S4, analyzing the log file through Hadoop technology, checking abnormal behavior of the examinee, and if the examinee opens an unallowed application program or file, generating a corresponding record and storing the record in an abnormal file;