Method for protecting local data storage file of environment-protective data acquisition and transmission instrument

The invention belongs to the technical field of environmental protection and pollution source automatic monitoring, and relates to a method for protecting a local data storage file of an environment-protective data acquisition and transmission instrument. The method includes an encryption link including steps as follows: interpolating device information into the head part of to-be-encrypted data so as to discriminate the user validity during decryption and further compose to-be-encrypted plain texts; grouping the to-be-encrypted plain texts; performing encryption to each group of to-be-encrypted plain texts to obtain cipher texts; storing the cipher texts sequentially to obtain an encrypted file. When a user needs to deal with the local storage data of the data acquisition and transmission instrument, discrimination and decryption are required to be performed. According to the invention, the local storage data of the data acquisition and transmission instrument can be encrypted and protected, and the method h