Methods and devices for selectively encrypting and decrypting data

Abstract

The invention belongs to the technical field of data encryption and decryption and in particular relates to methods and devices for selectively encrypting and decrypting data. The method for encrypting data comprises the following steps: generating true random numbers 0 and 1 strings with predetermined length as random seeds according to the preset method; acquiring data from the random seeds multiple times and cascading the acquired data every time into a random string with length not less than plaintext length; generating a plaintext encryption bit identifying random string according to the random string; selecting more than half plaintext data to be encrypted according to the plaintext encryption bit identifying random string; and arranging the encrypted data and the unencrypted data according to the plaintext position to form ciphertext. The device for encrypting data comprises a true random number generating module, an encryption bit identifying random string generating module, a plaintext data selecting and encrypting module and a ciphertext forming module. The invention also provides the method and device for selectively decrypting data. The method and device in the invention reduce the quantity of the encrypted or decrypted data, thus improving the performances of data encryption and decryption.

Description

technical field [0001] The invention belongs to the technical field of data encryption and decryption, and particularly relates to a method and device for selective encryption and decryption of data. Background technique [0002] Encrypting data has proven to be an effective method of data protection. The traditional data encryption method is to encrypt all data one or more times with a certain encryption algorithm. Because the data encryption and decryption process consumes a lot of system resources and time, it is difficult to obtain good data access while the data is protected. performance. SUMMARY OF THE INVENTION [0003] In order to solve the problems that the existing encryption technology consumes a lot of system resources and time in the encryption and decryption process, and the data access performance is poor, the present invention proposes a data selective encryption and decryption method and device, which can realize the protection between the obtained and th...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of the existing encryption technology that consumes a lot of system resources and time in the process of encryption and decryption, and has poor data access performance, the present invention proposes a data selective encryption and decryption method and device, which can realize the protection of the original encrypted data volume. To a comparable extent, the amount of encrypted or decrypted data is reduced, thereby improving the performance of data encryption and decryption

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