What is it about?
Recently, we suggest a key generation protocol based on Optical OFDM System to generate secret keys from OFDM symbols via exploiting the real-valued and bipolar proprieties of OFDM symbols. In this work, we evaluate the randomness of the keys generated by our recently key-generation protocol. We employ a statistical test suite of the National Institute of Standards and Technology (NIST) to test for randomness.
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Why is it important?
Randomness is the most critical performance metric of key generation systems. Cryptographic systems have strict requirements on key sequence randomness. The results of our system show that the keys produced from our key generation system pass all NIST tests. They also show that our key generation system provides uncorrelated keys with approximately equal probability of bits (discrete uniform distribution) on an average, which yields a high security system against statistical attacks.
Perspectives
Writing this article and getting it published is a suitable and adequate method of reporting new information to the scientific community. It is also the stepping stone for the professional career of a research scientist.
Yahya Al-Moliki
King Saud University
Read the Original
This page is a summary of: Randomness Evaluation of Key Generation Based on Optical OFDM System in Visible Light Communication Networks , Electronics Letters, October 2017, the Institution of Engineering and Technology (the IET),
DOI: 10.1049/el.2017.3525.
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Resources
Robust Key generation from Optical OFDM Signal in Indoor VLC Networks
This letter improves the confidentiality of visible light communication links by proposing a robust key-generation mechanism for optical orthogonal frequency division multiplexing (OFDM) systems in an indoor environment. In this letter, we propose to generate keys from the bipolar OFDM samples at the output of optical OFDM systems. We suggest to assign a part of cyclic prefix samples located in the region of small channel effect for keys generation during session period. The proposed scheme generates keys for medium access control (MAC) sublayer and physical layer. It provides high computational security against passive eavesdroppers in the physical level, because each signal frame is encrypted by a different key. So, the encryption in MAC level can be turned off without any risk in security. This setting can enhance the system throughput. Also, the implemented method achieves zero bit disagreement rates with key generation on the fly.
Secret Key Generation Protocol for Optical OFDM Systems in Indoor VLC Networks
Although the visible light communication (VLC) channel has superior security than radio frequency channels, its broadcast character makes VLC links vulnerable to eavesdropping. Therefore, VLC networks need to support security to protect the user's data against its eavesdroppers. Keyless security approaches have been proposed to provide security for VLC in the literature. Although these approaches support good security against eavesdroppers, they require complicated implementation. Algorithms of keys generation are essential to secure wireless links. Nevertheless, the common keys generation algorithms can be very complex and costly in many setups. They use up limited resources such as bandwidth. In this paper, we enhance the confidentiality of VLC networks by suggesting a new key extraction protocol for optical orthogonal frequency division multiplexing (OFDM) schemes in an indoor environment. We introduce to extract keys from the bipolar OFDM samples produced from optical OFDM schemes. We propose to allocate a portion of cyclic prefix samples placed in the area of low channel impact for keys extraction throughout session duration. The introduced protocol extracts keys for the medium access control (MAC) level and the physical level. It supports high physical-layer security as every OFDM signal frame is encrypted by a various key. Thus, the encryption at the MAC level can be switched off beyond any danger in security. This setup can improve the throughput of the system because it decreases the processing delay in the upper layer process. Also, the presented protocol supports zero bit mismatch rates with key extraction on the fly.
Physical-Layer Security against Known/Chosen Plaintext Attacks for OFDM-based VLC system
This work introduces a chaos-based physical-layer security approach for orthogonal frequency division multiplexing (OFDM)-based visible light communication (VLC) system with the capability against known-plaintext attacks (KPAs) and chosen-plaintext attacks (CPAs). This approach generates dynamic cyphertexts by exploiting the random characteristics of chaotic keys and input data. It performs chaotic permutation of subcarrier allocation in time/frequency domains and chaotic polarity reversal of subcarriers. For secret-key generation, we present chaotic key generation protocol with the help of the position-sensitive and real-valued channel state information of VLC channel. The results show our approach supports superior confidentiality for OFDM-based VLC systems against KPAs and CPAs.
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