Abstract
Key generation and distribution is a fundamental problem of communication security. To avoid the potential risk due to static key, a physical-layer dynamic key generation and encryption scheme is proposed for orthogonal frequency division multiplexing passive optical network (OFDM-PON) systems. By exploiting the inherent channel randomness, the shared secret key between the OLT and ONU is generated and renewed periodically, thereby effectively improving the security against malicious attacks. The transmission experiment of 3.5 Gb/s 16-quardrature-amplitued-modulatin encrypted OFDM data is successfully demonstrated over a 25 km standard single-mode fiber. The key space of the proposed encryption scheme reaches 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">66</sup> , which provides privacy between users and protection against eavesdropping.
Highlights
With the ever-growing data traffic of all kinds of applications and cloud services, security in optical networks has become a crucial issue of worldwide concern
To avoid the potential risk due to static key, a physical-layer dynamic key generation and encryption scheme is proposed for orthogonal frequency division multiplexing passive optical network (OFDM-PON) systems
Apart from the security measures based on cryptographic algorithms and authentication protocols at MAC or higher layers, security employed on physical layer provides a secure foundation for a robust network [8], which is transparent for different types of data
Summary
With the ever-growing data traffic of all kinds of applications and cloud services, security in optical networks has become a crucial issue of worldwide concern. Considerable efforts have been devoted to physical-layer security enhancement using digital signal processing (DSP) approaches in electric domain for OFDM-PON system [17]– [29]. The OFDM symbols are divided into sub-matrices and encrypted by different algorithms based on chaotic systems [21]–[23]. In this paper, we propose a channel-based dynamic key generation scheme for physical layer security in OFDM-PON systems.
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