Data encryption/decryption checking method and system

Abstract

The invention discloses a data encryption / decryption checking method and system. The method comprises the following steps that: an encryption device performs Xor operation on each data section in plaintext data at an encryption end to acquire a checking code, combines the plaintext data at the encryption end with the checking code to acquire combined data, encrypts the combined data to acquire a ciphertext and outputs the ciphertext to a decryption end; and a decryption device decrypts the received ciphertext to acquire decrypted data, separates out the plaintext data at the decryption end and the checking code from the decrypted data, and checks the checking code. According to the invention, the checking code is generated through the simple Xor operation, and the data is encrypted by adopting one-time encryption transformation, so that the encryption transformation frequency is reduced, the calculation overhead is prevented from being multiplied, and the encryption / decryption efficiency is improved effectively; and by checking the correctness of the checking code, whether the data is wrong or maliciously changed during encryption or decryption and transmission or storage can be detected; and the confidentiality and correctness of the data are guaranteed at the same time.

Description

technical field [0001] The invention relates to the technical field of data processing, in particular to a data encryption / decryption verification method and system thereof. Background technique [0002] At present, the encryption methods used in data transmission and storage processes mainly use block encryption algorithms, such as AES, DES, SM1, etc., to encrypt and transform data, and then transmit or store after forming ciphertext. This method can hide the original data and meet the requirement of protecting data privacy. However, this encryption method does not verify the data. If there is an error or malicious tampering in the data during transmission and storage, this encryption method cannot identify it, resulting in an error that the decrypted data is different from the original data. Condition. [0003] In order to solve the above problems, the existing method is to add a section of verification code in addition to encrypting and transforming the data. The block...

AI Technical Summary

Problems solved by technology

Although this method can judge whether the received data is inconsistent with the original data through the receiver or user according to the check code in the process of data transmission and storage, that is, to judge whether there is an error in the data encryption or decryption process or whether it has been maliciously tampering, but this method of adding a checksum in addition to the encryption transformation has the disadvantage of requiring two rounds of block cipher operations on the data, one for data encryption transformation, and the other for calculating the checksum

Since the block cipher operation requires a lot of computing power, this method will double the computing overhead, so when it is applied to high-speed network transmission and mass data storage, it will greatly reduce the transmission and storage performance and become the bottleneck of the system.

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