Encryption method based on AES encryption algorithm

Abstract

The invention discloses an encryption method based on an AES encryption algorithm. Existing encryption algorithms are divided into a symmetric encryption algorithm and an asymmetric encryption algorithm, the same key is used for encryption and decryption operation, a ciphertext obtained by encrypting the same plaintext through AES is generally fixed, a plaintext-ciphertext table is sufficiently comprehensive, an illegal cracker can crack the plaintext, and leakage of plaintext data information is caused. The method comprises the following steps: firstly, inputting a plaintext into an AES encryption algorithm in a parameter form, and executing a key expansion operation to obtain a round key; executing loop iteration operation of round encryption: byte substitution, row shift, column mixing and round key addition to obtain a ciphertext C; executing a pseudo-random number generation function, and generating a random data character string G by taking the time of the system as a seed; the final ciphertext is composed of a ciphertext C and a random data character string G; the randomness of the ciphertext is realized, the cracking difficulty is increased, and the safety performance of an encryption algorithm is improved. The invention is applied to the encryption method based on the AES encryption algorithm.

Description

technical field [0001] The invention relates to the technical field of Internet of Things data node data encryption, in particular to an encryption method based on an AES encryption algorithm. Background technique [0002] Data encryption is a reliable method to ensure the data security of IoT data nodes. Data is converted from plaintext to ciphertext through encryption algorithms and encryption keys, thereby protecting data security; [0003] Existing encryption algorithms are divided into two types: symmetric encryption algorithm and asymmetric encryption algorithm. The characteristic of symmetric encryption algorithm is that the encryption and decryption operations use the same key, such as AES encryption algorithm and DES encryption algorithm; the characteristics of asymmetric encryption algorithm are Encryption and decryption operations use different keys, including ABE encryption algorithm, ECC encryption algorithm, and homomorphic encryption algorithm; the predecessor...

AI Technical Summary

Problems solved by technology

[0004] The ciphertext obtained by using AES to encrypt the same plaintext is usually fixed, so that a table corresponding to plaintext-ciphertext can be obtained. As long as the plaintext-ciphertext table is comprehensive enough, illegal crackers can use the plaintext-ciphertext table to crack Calculate the plaintext you want to crack, resulting in the leakage of plaintext data information

[0005] Patent Document 1 (publication number: CN106385313A) discloses a random ciphertext system based on block encryption algorithm and its implementation method, which automatically judges the length of the number of bits of the encrypted plaintext and the block length of the block encryption algorithm used, and intelligently fills the plaintext The random ciphertext generation method can generate different ciphertext information after each encryption, which greatly increases the cost for hackers to obtain sensitive data, increases the strength of ciphertext, and can only improve the security of related systems

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