Secure Communication Technology In Wireless Ad Hoc Networks

In recent years, with the rapid development of mobile communication technology, su ch as 3G network, 4G network and Wireless Local Area Network etc, wireless communication has been more and more widely used in real life practice with increasingly importance.Wireless Ad Hoc Networks is a kind of wireless communication network without centralized control nodes. This network requires no base stations, routers, wireless access points and other infrastructures, and the connectivity can be achieved by the wireless terminal devices through a self-organization approach. So, wireless Ad Hoc networks can be more efficiently and practically deployed for further communications, and hence is applicable to some emergency communications. However, the wireless transmission property and the power-constraint feature of the nodes in the wireless ad hoc networks may lead to serious loss of communication data and communication data being intercepted, interpreted, tampered and misused by the adversary. So, we use encryption algorithm in Wireless Ad Hoc Networks in order to ensure the communication safety of Wireless Ad Hoc Networks. The contributions of this dissertation are as follows.1. This dissertation introduces the fundamental principles of the Grain 128 algorithm in Grain family and improves the algorithm according to the features of the Wireless Ad Hoc Networks. We split the encrypted messages into blocks and add identifying serial number in each block. In the decryption process, we can judge whether there is data loss based on the identifying serial numbers in order to correctly decrypt the received ciphertext. Thus we achieve the decryption synchronization goal.2. The improved Grain 128 algorithm is applied to the Wireless Ad Hoc Networks, and the Grain 128 algorithm is examined with respect to the encryption/decryption correctness, data loss, and efficiency. The experimental results demonstrate the following claims. Firstly, the Grain 128 algorithm can encrypt and decrypt correctly. Secondly, the algorithm can correctly decrypt the received ciphertext blocks in presence of data loss. Finally, when we transfer 100 MB data, the communication delay is only 2.54% after the Grain 128 algorithm is used.