Improving code division multiple access security by applying encryption methods over the spreading codes

Tafaroji, M.; Falahati, Abolfazl

doi:10.1049/iet-com:20060295

Cited by 16 publications

(40 citation statements)

References 3 publications

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“…In [2,3], the fundamental goal of spread spectrum system is considered as; to increase the dimensional characteristic of the signal, hence, to make eavesdropping and/ or jamming more difficult since there are more dimensions of the signal to consider. In fact, the main method of increasing the dimensionality of the signal is to widen the signal's spectral occupancy [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…In fact, the main method of increasing the dimensionality of the signal is to widen the signal's spectral occupancy [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…Nonetheless, because of its remarkable advantages, spread spectrum has been adopted by many wireless technologies. For example, the IEEE 802.11b standard for wireless LAN employs DSSS over the 2.4-GHz free spectrum, whereas the Bluetooth standard uses frequency hopping spread spectrum (FHSS) for simplicity [1][2][3]. Furthermore, the main weakness of the wireless communication security system is the simplicity of accessing the communicating signal through the channel.…”

Section: Introductionmentioning

confidence: 99%

“…If the messages are encrypted, after storing the encrypted messages with some cryptoanalysis methods, the original message can be smeared out. Now, if the received radio signals from the wireless channel is spread in a form that the intruder cannot ac-cess the despread spectrum and receives only a signal similar to noise, a perfectly secure radio transmission channel is achieved [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…However, if eavesdroppers can obtain 42 bits of plaintext-cipher-text pairs, the long-code mask can be recovered after dropping the transmission on the traffic channel for about one second [3,6,7].…”

Section: Introductionmentioning

confidence: 99%

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

Ebrahimzadeh¹,

Falahati²

2013

JIS

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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 multiuser 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.

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Section: Introductionmentioning

confidence: 99%

“…In fact, the main method of increasing the dimensionality of the signal is to widen the signal's spectral occupancy [2,3].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Ebrahimzadeh¹,

Falahati²

2013

JIS

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Nested and interleaved direct sequence spread spectrum to enhance CDMA security and bit error rate performance

Falahati

Sanandaji

2016

Int J Communication

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Two new methods, the nested direct sequence spread spectrum and interleaved direct sequence spread spectrum, are introduced in view of the previously investigated spread spectrum methods. In the nested direct sequence method, the security is maintained, and the cross-correlation between different codes resulting in multi-user interference that corresponds to BER performance is improved, while in the interleaved direct sequence spread spectrum, the security is improved and BER performance is maintained. Both methods are analysed by mathematical relations as well as computer simulations and are compared with the existing methods.

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Blind adaptive detection using approximate oblique projector for synchronous DS/CDMA communication

Nagase

Oishi

Furukawa

2019

IEEJ Transactions Elec Engng

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This article presents a blind adaptive detector based on an approximate oblique projector (AOP) for interference cancellation in direct‐sequence code‐division multiple‐access (DS/CDMA) system. An expression for obtaining the AOP from the inverse of the correlation matrix of received signals without a prior knowledge about the structured interference subspace is derived. Applying the matrix inversion lemma to compute the inverse of the correlation matrix is useful for updating the AOP. Simulation results demonstrate that the proposed blind adaptive detector is suitable for a dynamic environment. © 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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Improving code division multiple access security by applying encryption methods over the spreading codes

Cited by 16 publications

References 3 publications

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

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

Nested and interleaved direct sequence spread spectrum to enhance CDMA security and bit error rate performance

Blind adaptive detection using approximate oblique projector for synchronous DS/CDMA communication

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