We present a design for superconducting nanowire binary shift register, which stores digital states in the form of circulating supercurrents high-kinetic-inductance loops. Adjacent loops are connected with nanocryotrons, three terminal electrothermal switches, and fed an alternating two-phase clock to synchronously transfer state between A two-loop serial-input register was fabricated thin-film...

The structure of test system based on application built-in self-test (BIST) circuitries has been proposed. The main idea is oriented on minimization of hardware overheads and dealt with automatization of BIST-circuitries generation. Test generator based on linear feedback shift register (LFSR) provides two types of testing pseudorandom and deterministic. The proposed modified Berlekamp–Massey a...

We analyse asymptotically performances and convergence of fast iterative correlation attacks for the cryptanalysis of stream ciphers using linear feedback shift registers as autonomous stages. Finally, we describe and analyse an improvement for this class of cryptanalytical algorithms.

We consider the problem of estimating the feedback coefficients of a linear feedback shift register (LFSR) based on noisy observations. In the current approach, the coefficients are endowed with a probabilistic model. Gradient ascent updates to coefficient probabilities are computable using recursions developed by means of the EM algorithm. Reduced-complexity approximations are also developed b...

Binary sequences are the most fundamental random numbers and have been extensively used in several applications such as spread-spectrum CDMA communications and cryptosystems. M-sequences, Kasami sequences, and Gold sequences, all of which can be generated by linear feedback shift registers (LFSRs), are well known as conventional binary sequences [1]. It is also well known that chaos phenomena c...

The shrinking generator is a well-known keystream generator composed of two linear feedback shift registers, LFSR1 and LFSR2, where LFSR1 is clock-controlled according to regularly clocked LFSR2. A probabilistic analysis of the shrinking generator which shows that this generator can be vulnerable to a specific fast correlation attack is conducted. The first stage of the attack is based on a rec...

We propose a novel system for optical encryption based on an optical XOR and optical Linear Feedback Shift Register (oLFSRs). Though we choose LFSR for its ability to process optical signals at line rate, we consider the fact that it offers no cryptographic security. To address the security shortfall, we propose implementation of parallel oLFSRs, whereby the resulting key-stream at line rate is...

This is the second of a series of intended reports on realization of sequential machines with shift registers and on properties of shift registers. Some of the pathological cases for the shift register realization algorithms SRR/GSRR reported in the previous report are investigated here. One of the pathological cases turned out to be simple cycles, and based on the work of Yoeli, an algorithm h...