Abstract

Due to the fast development in electronic technology, some mobile devices are designed for new services in important applications in life. In this paper, we propose a new method of message security by using the coordinates in GPS service, where it can specify the path of movement by taking some coordinates during travel of mobile node MN and estimate the following situation of MN in a constant time interval. This new estimated coordinate is applied in our secret key. Dynamic Toleration Distance (DTD) is also designed in our key to increase its practicality. The security analysis shows that the probability to break this key is almost impossible due to the security of coordinates and DTD, and adjusting the length of the Random key. Experimental study shows that the ciphertext can only be decrypted under the restriction of DTD. It illustrates that our secret key (Sec_key) is effective and practical for data transmission in mobile environment.

Key words: MN, GPS, DTD, sec_key, data encryption, data decryption.