190 results about "Key space" patented technology

The invention discloses a Lorenz chaotic pseudo-random sequence generator based on an m sequence. The generator comprises an initial value selection module, a Lorenz chaotic iteration module, a quantification module and an m sequence disturbance module, wherein the initial value selection module is used for giving an initial value needed by a Lorenz chaotic equation before Lorenz chaotic iterationis started and giving an output value generated in last iteration to next iteration to serve as an initial value; the Lorenz chaotic iteration module realizes operation of the Lorenz chaotic equationthrough floating point fractional arithmetic and generates a chaotic real value sequence; the quantification module converts the chaotic real value sequence into a pseudo-random sequence through a bit sequence design method; and the m sequence disturbance module generates the m sequence through a linear feedback shift register and uses the m sequence to disturb the chaotic real value sequence, the disturbed chaotic real value sequence is returned to the initial value selection module, and next iterative operation is performed. The generator overcomes the defect of randomness of an existing pseudo-random sequence, and the generator has a large key space, can resist an exhaustive attack and meets the requirements of various application occasions.