Symmetrical encryption and decryption algorithm subpackage processing method

Abstract

The invention provides a symmetric encryption and decryption algorithm subpackage processing method, which comprises the following steps of: S1, dividing an x-bit plaintext into front y bits and rear z bits, generating a y-bit ciphertext from the front y bits through a symmetric encryption algorithm with the same key, and ensuring that the encryption length is y bits; s2, the rear z bits of the x-bit plaintext generate z-bit ciphertext through a symmetric encryption algorithm with the same key, x, y and z are positive integers and are integer multiples of the minimum length of the encryption algorithm, and the rear z bits of the plaintext resume through a breakpoint; and S3, connecting the ciphertexts obtained through the two times of segmentation encryption in the S1 and the S2 together to obtain a final ciphertext. The method has the advantages that: 1, time consumption can be saved under the condition that a transmission medium is unstable; and by adopting segmented encryption transmission, the probability of transmission failure is greatly reduced, and the wasted time is in direct proportion to the data length even if the transmission failure occurs. Therefore, the time overhead is saved. Under the condition that the transmission capacity of the transmission medium is insufficient, subpackage processing is adopted, and the limitation of the transmission medium can be avoided;

Description

technical field [0001] The invention relates to the technical field of encryption, in particular to a packet processing method for a symmetric encryption and decryption algorithm. Background technique [0002] In today's society, encryption technology is used in all walks of life, especially in the fields of finance and security. Among them, the symmetric encryption algorithm is an earlier encryption algorithm with mature technology. In the symmetric encryption algorithm, the data sender processes the plaintext (original data) and the encryption key together with a special encryption algorithm, turning it into complex encrypted ciphertext and sending it out. After the recipient receives the ciphertext, if he wants to interpret the original text, he needs to use the encrypted key and the inverse algorithm of the same algorithm to decrypt the ciphertext to restore it to readable plaintext. In the symmetric encryption algorithm, only one key is used, and both the sender and r...

AI Technical Summary

Problems solved by technology

[0011] 3. The process of key transmission is not safe, and it is easy to be cracked, and key management is also troublesome;

This leads to a waste of encryption time on the A side, time on the transmission medium B, and decryption time on the C side

[0017] 2: Due to the limitation of the transmission volume of the transmission medium, communication cannot be performed

[0018] The amount of encrypted data on the A side is 10k, and the existing transmission medium B can only transmit 8k at most, so it cannot communicate to the C side

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