SDH signal encryption method realized by key bytes

Abstract

The invention relates to a method which realizes the encryption of SDH signals by making use of key bytes; wherein, the encryption of frame synchronization bytes is realized by randomly selecting a key from a key table by every N frames of a sending end and inserting a key number of the key into unused overhead bytes of a frame structure after the sending end and a receiving end realize the framesynchronization, and at the same time, the encryption operation for the present frame synchronization bytes is carried out by the key and operating results are inserted into the frame structure as newframe synchronization bytes and every N frames change a value of the frame synchronization bytes; a frame synchronization module of the receiving end continuously monitors an unused byte, and once the value changes, corresponding keys are found from the key table to make decryption operation for the value of the present frame synchronization bytes according to the value; the encryption of data communication channel encryption bytes is made before the SDH is framed and the decoding of the data communication channel encryption bytes is realized after the receiving end is decoded. The method avoids the problem brought about by direct encryption of high speed information payload, lowers down the requirements for the processing speed of hardware in the encryption operation and has good encryption effect.

Description

technical field [0001] The invention relates to a method for encrypting SDH signals by utilizing key bytes. Background technique [0002] The basic transmission module of the digital synchronization series (SDH) is STM-1, the bit rate is 155520kbit / s, most of the backbone lines use STM-16, the bit rate is 2488320kbit / s, and some trunk lines use STM-64, the bit rate is 9953280kbit / s , which belongs to the high-speed channel. [0003] For information encryption in the SDH transmission system, source encryption or SDH channel information payload encryption is mainly used at present. Source encryption only encrypts low-speed information flow; channel encryption mainly encrypts information payload. Although it reduces the encryption rate to a certain extent, it still relies heavily on high-speed encryption chips. For some ultra-high-speed data The encryption (such as Tbit / s level) is completely powerless, and the encryption of the information payload cannot achieve complete enc...

AI Technical Summary

Problems solved by technology

Source encryption only encrypts low-speed information streams; channel encryption mainly encrypts information payloads. Although it reduces the encryption rate to a certain extent, it still relies heavily on high-speed encryption chips. For some ultra-high-speed data Encryption (such as Tbit / s level) can do nothing at all, and the encryption of the information payload cannot realize the complete encryption of the high-speed channel flow and key bytes. Although the intruder does not know the true meaning of the information, they only need to know the trend and frequency of the information. can achieve the purpose of eavesdroppers

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