Data transmission method, system and device and computer readable storage medium

The invention discloses a data transmission method, system and device and a computer readable storage medium, and is applied to a data transmission end to obtain to-be-transmitted target data; mapping each character in the target data to obtain a character mapping result; coding each character mapping result to obtain a character coding result; flipping each character coding result to obtain a character flipping result; splicing all the character flipping results to obtain spliced data; symmetrically encrypting the spliced data to obtain target encrypted data; and transmitting the target encrypted data to a data receiving end. In the application, the data transmission end can obtain the corresponding target encrypted data by mapping, encoding, overturning, splicing and symmetrically encrypting the to-be-transmitted data, the whole process is simple, convenient and safe, the implementation is convenient, the encryption efficiency is high, and the applicability is good. According to the data transmission system