Data encryption and decryption method and device for Ethernet passive optical network (EPON) system

Abstract

The embodiment of the invention provides a data encryption method and a data encryption device for an EPON system. According to the method, M data encryption units are used for performing multiple stirring encryptions in parallel on M bytes. The method comprises the following steps of: performing primary stirring encryption on the input encrypted Nth byte by using a first sub-key; performing primary XOR operation on the Nth byte subjected to the primary stirring encryption and a first group of preset bytes; performing secondary stirring encryption on the byte subjected to the primary XOR operation by using a second sub-key; performing second XOR operation on the Nth byte subjected to the secondary stirring encryption and a second group of preset bytes; and performing tertiary stirring encryption on the byte subjected to the secondary XOR operation by using a third sub-key. The method provided by the embodiment of the invention meets the requirement of the next generation EPON system for high data rate. The embodiment of the invention also provides a data decryption method and a data decryption device for the EPON system.

Description

technical field [0001] The present invention mainly relates to the data encryption method of Ethernet passive optical network (Ethernet Passive Optical Network, EPON) system, particularly, relate to a kind of data encryption method and equipment for 10 Gigabit Ethernet passive optical network (10GEPON), And its corresponding data decryption method and device. Background technique [0002] The Ethernet-based passive optical network (EPON) system is a fiber access system that closely combines Ethernet technology with passive optical networks. Generally speaking, the EPON system adopts a point-to-multipoint network topology, and each optical line terminal (OLT) is connected to multiple optical network units (ONUs) through an optical distribution network (ODN). The downstream direction of the EPON system adopts the broadcast method for data transmission, so any ONU can receive the Ethernet data frames of all users, which leads to the problem of data security, that is, malicious...

AI Technical Summary

Problems solved by technology

Since the bus width used by the next-generation EPON system is wider, such as the 10G EPON system uses a 64-bit bus width, the existing "triple stirring" data encryption method is no longer applicable to the next-generation EPON system

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