Linear feedback shift register, and method for selective encrpytion code and decryption code

Abstract

The shift register used in system of providing enciphering code and deciphering code has one n-th order linear feedback shift register to provide polynomial coefficients and one memory to store calculation result with the polynomial coefficients of the linear feedback shift register and the received input sample. The memory has one input end to receive input sample and one output corresponding to the polynomial coefficients of the linear feedback shift register.

Description

technical field [0001] The present invention relates to a device for providing encryption and decryption, especially for linear feedback shift registers using look-up tables or sub-tables , the invention is described in full detail. Background technique [0002] Security measures are an important factor in modern communication and computer systems. In order to increase the security measures of the system, it is necessary to engage in the encryption and decryption of information. Before transmitting information, the data transmitter must first encrypt the data (which may be called plaintext) and then transmit the encrypted information (which may be called ciphertext) to the receiver. The receiver must decrypt the ciphertext before the original plaintext information can be recovered and understood. [0003] A commonly used element in a security measure system is a linear feedback shift register (hereinafter referred to as LFSR), which is used in both encryption and decrypti...

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Problems solved by technology

However, when the LFSR polynomial changes, the original hardware logic circuit must be redesigne...

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