In this paper, we analyze the security of the stream cipher Helix, recently proposed at FSE’03. Helix is a high-speed asynchronous stream cipher, with a built-in MAC functionality. We analyze the differential properties of its keystream generator and describe two new attacks. The first attack requires 2 basic operations and processes only 2 words of chosen plaintext in order to recover the secr...

The paper analyses generator operations of asynchronous machines when they are connected to a passive electrical network either directly or by an intermediate static power converter. The analysis is performed by taking into account the saturation phenomena of the main magnetic circuits of the machine. Mathematical models of both physical configurations are given and their non-linearities are ev...

In this paper, a central pattern generator (CPG) model based on asynchronous coupling of cellular automaton (CA) phase oscillators for hexapod robot is presented. The presented CPG composed the CA whose discrete state transitions are triggered by multiple clocks. Then, evaluation functions to quantify synchronization states target gait patterns in introduced. Analyzing synchronizations using fu...

The increasing complexity of modern VLSI systems has caused designers to reevaluate the ageold decision of using a single, central clock and instead turn to asynchronous or globally asynchronous, locally synchronous (GALS) designs. Communication between synchronous and asynchronous subsystems is difficult to do reliably and efficiently. In this paper, we review the background for the difficulty...

Flywheels are typically used as storage elements in isolated wind plants, especially those running at almost constant speed, connected to synchronous generators and diesel engines. Nowadays, systems with variable speed are under development, so the amount of available energy in the flywheel is highly increased. In this paper a comparison between an almost constant speed system and variable spee...

Recent analysis of real network traac has shown that a large number of traac sources produces a traf-c stream that is self-similar over several time scales. Motivated by this observation a high-speed Asynchronous Transfer Mode (ATM) traac generator based on fractional Brow-nian motion is presented. The traac simulator generates call arrivals as well as the desired traac parameters for each call...

This paper describes the design of UART (universal asynchronous receiver transmitter) based on VHDL. As UART is consider as a low speed, low cost data exchange between computer and peripherals.[1].To overcome the problem of low speed data transmission , a 16 bit UART is proposed in this paper. It works on 9600bps baud rate. This will result in increased the speed of UART.Whole design is simulat...