خلاصة:
Virtual learning is a new idea that has gotten a new form with the emergence of new technologies such as the wireless networks. The mobile phone (cell phone) is a device that is used by most people nowadays. Therefore, one can use the mobile phone for virtual learning on a wide scale. One of the popular and at the same time simple and inexpensive services on the mobi Ie phone is the SMS (Short Message Service). In this paper, we propose a method for taking multiple-choice quizzes by using the SMS on mobile phones. In the prov ision of these tests, after coding the questions with a key, some SMS messages were sent to the student along w ith the answers of the questions, which were steganograph y in an image. The student, after receiving and answering the questions, receives his grade at the client-side and then the grade and student answers are hidden in an SMS picmre message and sent back to the instructor. Also, the location of student and the time that he took the exam are sent to the instructor by another SMS to prevent the possibility of any cheating. Moreover, the correct answers of the questions are destroyed within the image after they are extracted from image so as to eliminate the possibility of any cheating. The instructor also, after receiving the image and extracting the grade, records the student's grade. Moreover. the instructor can find any cheating by comparing students locations, times they took the exam and their answers. Because of using the steganography method in sending the answers and grades, and also sending the student's location and time of quiz, this method is highly secure and the possibility of cheating in the exam is reduced. This method was implemented with the J2ME language on a Nokia 3250 mobile phone.
ملخص الجهاز:
Also, the location of student and the time that he took the exam are sent to the instructor by another SMS to prevent the possibility of any cheating.
Because of using the steganography method in sending the answers and grades, and also sending the student's location and time of quiz, this method is highly secure and the possibility of cheating in the exam is reduced.
Cheat Prevention, SM S (Short Message Service), Mobile Phone, M-Learning, Steganography, Location Based Services INTRODUCTION The method of learning in the last several decades has undergone many changes and developments.
a method of steganography of grades within an SMS picture message is Used so as to pre vent cheat ing by the student.
There is a picture in the first SMS message (which will be explained later), in which the answers of the tests are hidden by using the steganography method.
Here, we, by using the method of steganography in the SMS, hide the test answers in an SM S picture message.
The program gives time to the student to answer the received questions within a certain period of time extracted from inside the first SMS picture message.
After the student answers all the questions, the program provides the grade and the grade along with the answers are hidden in an SMS picture message and sent back to the instructor.
Now, the instructor receives the SMS picture message contain ing the student's grade and answers, and.
In the student's program, which is run on his mobile phone, six SMS messages are received.