Method and device for encrypting and decrypting data processed by erasure code

Abstract

The invention discloses a method and device for encrypting and decrypting data processed by erasure code. The method comprises steps of performing encryption on part of information in original coding information to obtain encrypted information after adopting an erasure code to perform coding on original information to obtain the original coding information, and constituting unencrypted original coding information which is not encrypted in the original coding information and encrypted information into coding information for storing. When decryption and decoding are performed on coding information of the original information, coding information having a same data quantity as the original information is extracted and decrypted and is constituted with other coding information into original coding information of the original information; an erasure code is adopted on the original coding information of the original information to perform decoding to obtain original data. The method and device can either prevent loss of data or guarantee safety of data, reduce the decrypted data quantity and improve encryption efficiency.

Description

technical field [0001] The invention relates to the field of computers, in particular to a method and device for encrypting and decrypting data processed by an erasure code. Background technique [0002] With the development of computer technology, it is necessary to ensure that the data of the computer is not lost. In order to ensure that the data of the computer is not lost, at present, there are usually two ways to achieve: [0003] The first method adopts the multi-copy method, that is, the original information is copied and backed up multiple times to obtain the backup data. Even if the original information is lost, the backup data will still exist, but the disadvantage of this method is that it doubles the storage capacity of the computer. amount, wasting storage space. [0004] The second method uses erasure codes to process original information to obtain encoded information corresponding to the original information. Erasure codes actually establish a mathematical ...

AI Technical Summary

Problems solved by technology

However, the disadvantage of using this method of encryption is that the amount of encrypted data is large, which will affect the encryption efficiency, and further affect the efficiency of computer processing data. For example, to encrypt 1G bytes of data, the amount of data that needs to be processed 1G bytes

In particular, in order to improve data security and increase the difficulty of cracking data, the encryption algorithm is becoming more and more complex, and increases linearly with the total amount of data to be encrypted. When the total amount of data to be encrypted is large, the encrypted The time becomes unacceptable, which further leads to the reduction of encryption efficiency

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