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As RFID technology being applied more and more widely, its security and privacy problems are increasingly called into question. Means of RFID attack emerge in endlessly and RFID security becomes a relatively new research area. This paper makes research on one of the attack methods--Denial of Service (DoS). We thoroughly expound and analyze the active jamming to the RFID system which, mentioned as Active Jamming Attack later, is a form of DoS. Through theoretical derivation and simulation, the most effective active jamming approach is summarized, which is also demonstrated by presenting experimental results. This work may provide a reference for RFID designers to prevent or weaken this type of DoS attacks to the greatest extent.

With the development of communication countermeasure technology, the existing communication mode is exposed to intercept or decipher in the covert transmission of information. Therefore, the development of a new concept and principle covert communication technology with low interception probability and anti-non-cooperative demodulation has drawn increasing attention. In this treatise, we propose a chaotic multi-tone modulation and demodulation technology thus present a method to construct the covert communication system. The technology constructs chaotic multi-tone sets to express the baseband information with the multi-value mapping based on the dynamics principle, which can express the same baseband information with different multi-tone groups. Signal modulation is accomplished by combining frequency hopping and baseband information scrambling technology. Multi-value mapping is adopted to complete chaotic multi-tone modulation. Specifically it has strong information concealment and anti-noncooperative demodulation characteristics. In order to solve the demodulation problem of the cooperative party, we present a demodulation scheme based on chaotic multi-tone and provide a complete chaotic multitone communication system construction scheme. Simulation results verify the performance of the proposed method. INDEX TERMS Chaotic multi-tone, covert communication, low interception probability, information concealment.

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