Weight reduction and redundancy elimination system and method for text travel consumption data in ciphertext state

The invention provides a weight reduction and redundancy elimination system and method for text travel consumption data in a ciphertext state, and belongs to the field of data storage. The cloud server management end is used for acquiring a ciphertext of the text travel consumption data and a trap door corresponding to the ciphertext of the text travel consumption data to obtain a ciphertext trap door pair; and performing an equivalent test on the at least two groups of ciphertext trap door pairs, and if a test result is a preset value, performing a deletion operation on the text travel consumption data corresponding to the at least one group of ciphertext trap door pairs. According to the method and the device, redundant data can be deleted, so that the storage management of the text travel consumption data on the cloud server by a text travel consumption data administrator is ensured, namely, important data is reserved, and unnecessary, repeated or redundant data is subjected to deduplication, compression a