Abstract
Frequency Hopping Spread Spectrum (FHSS) system is often deployed to protect wireless communication from jamming or to preclude undesired reception of the signal. Such themes can only be achieved if the jammer or undesired receiver does not have the knowledge of the spreading code. For this reason, unencrypted M-sequences are a deficient choice for the spreading code when a high level of security is required. The primary objective of this paper is to analyze vulnerability of linear feedback shift register (LFSRs) codes. Then, a new method based on encryption algorithm applied over spreading codes, named hidden frequency hopping is proposed to improve the security of FHSS. The proposed encryption security algorithm is highly reliable, and can be applied to all existing data communication systems based on spread spectrum techniques. Since the multi-user detection is an inherent characteristic for FHSS, the multi-user interference must be studied carefully. Hence, a new method called optimum pair “key-input” selection is proposed which reduces interference below the desired constant threshold.
Highlights
Further employment of wireless communication system to exchange vital and critical electronic information requires an urgent attention to design reliable secure systems
A new method based on encryption algorithm applied over spreading codes, named hidden frequency hopping is proposed to improve the security of Frequency Hopping Spread Spectrum (FHSS)
A thorough investigation revealed security weaknesses of PN sequences. These drawbacks are challenged deploying a new method called hidden frequency hopping to augment the built-in security of FHSS systems
Summary
Further employment of wireless communication system to exchange vital and critical electronic information requires an urgent attention to design reliable secure systems. This requirement is further strengthen for military communication systems where information transmission heavily relies upon wireless networks [1]. In [2,3], the fundamental goal of spread spectrum system is considered as; to increase the dimensional characteristic of the signal, to make eavesdropping and/ or jamming more difficult since there are more dimensions of the signal to consider. The main method of increasing the dimensionality of the signal is to widen the signal’s spectral occupancy [2,3]
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