On the other hand, quantum key distribution schemes (QKD) are evolving from the initial discrete variable proposals (DV-QKD) based on the transmission of polarized photons using non-orthogonal states towards continuous variable systems (CV-QKD) based in the transmission of coherent states which allow the use of standard communications components and, therefore, lower implementation cost. LFSR are also employed to design true random number generators (TRNG) in radio frequency identification (RFID) systems. The uniform distribution of the generated numbers allows LFSR to be widely used in communication and cryptographic applications, as part of the core of CDMA systems and stream ciphers belonging to the security standards and protocols of wireless and mobile telecommunication systems such as Bluetooth, IEEE 802.11 WLAN, GSM and LTE. Linear feedback shift registers (LFSR) have always been a basic resource for the pseudorandom number generation (PRNG) due to their low cost implementation, the good statistical properties of the values produced and the simplicity of their mathematical model that allows a priori analysis of the behavior of the system.
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