Frequency Hopping Spread Spectrum Security Improvement with Encrypted Spreading Codes in a Partial Band Noise Jamming Environment

Amirhossein Ebrahimzadeh, Abolfazl Falahati

Digital Cryptography and Coding Laboratory (DCCS Lab), Department of Electrical Engineering, Iran University of Science and Technology, Tehran, Iran.

DOI: 10.4236/jis.2013.41001                

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.

Keywords

Frequency Hopping Spread Spectrum; Key Distribution Centre; Key Encryption Key; Linear Feedback Shift Register; Frequency Hopping Code Division Multiple Access; Direct Sequence Spread Spectrum

Conflicts of Interest

The authors declare no conflicts of interest.

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