An encryption method applicable to SDH

A technology of synchronous digital series and encryption method, which is applied in the direction of digital transmission system, transmission system, electrical components, etc., to achieve the effect of enhancing security and confidentiality

Inactive Publication Date: 2005-06-29
NO 30 INST OF CHINA ELECTRONIC TECH GRP CORP
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Problems solved by technology

[0003] High-speed block encryption usually adopts the method of changing the key at regular intervals, and the replaced key is reused within a period of time. The disadvantage of this method is that the encrypted result of the same plaintext is the same, which provides a possibility for code breakers. take the opportunity

Method used

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  • An encryption method applicable to SDH
  • An encryption method applicable to SDH
  • An encryption method applicable to SDH

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Embodiment Construction

[0014] The encryption method applicable to the synchronous digital series of the present invention will be further explained and described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0015] figure 1 It is a SDH frame structure diagram. In the figure, SDH is the English abbreviation of Synchronous Digital Series, and SDH frame structure 1 is a repetitive pattern arranged in an orderly manner. It is a code block composed of 8bit bytes with 9 rows and 270×N columns. Its frame period is constant at 125 microseconds.

[0016] SDH frame structure 1 is composed of four main areas: segment overhead SOH, management unit pointer AUPTR, channel overhead POH and payload, where the payload is the plaintext we need to encrypt.

[0017] figure 2 It is a schematic diagram of a specific embodiment of the present invention. In the figure, an encryption method suitable for synchronous digital series of the present invention uses a ra...

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Abstract

This invention discloses a ciphering method for synchronous digital series characterizing in applying a random number generator to generate different random numbers, using said different random numbers as the ciphered keys to cipher different frames. The random numbers as the deciphered keys are transferred to the deciphering end utilizing the reserved bytes in the frame structure. This invention is a ciphering method for synchronous digital series. Since the ciphered keys generated by the generator are randomly generated, the ciphered results of same cleartexts are not the same, which increases its safety and security

Description

technical field [0001] The present invention relates to an encryption method, in particular to an encryption method suitable for synchronous digital series. Background technique [0002] Modern communication encryption usually adopts sequence encryption or block encryption. Sequence encryption generally encrypts all bit streams on the line and is suitable for point-to-point encryption; group encryption multi-pair payload encryption is suitable for end-to-end encryption. [0003] High-speed block encryption usually adopts the method of changing the key at regular intervals, and the replaced key is reused within a period of time. The disadvantage of this method is that the result of encrypting the same plaintext is the same, which provides a possibility for code breakers. Take the opportunity. Contents of the invention [0004] The purpose of the invention of the present invention is to overcome above-mentioned deficiency, provide a kind of encryption method that can not o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/18
Inventor 刘涧疆
Owner NO 30 INST OF CHINA ELECTRONIC TECH GRP CORP
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