Compression encryption method for big data file

TL;DR: In this article, the authors proposed a compression encryption method for a big data file, which enables an original plaintext to be stored so as to reduce the reading and writing of data, especially the writing, achieves the covering of encrypted plaintext, and enables a compressed and encrypted ciphertext can be stored independently.

Abstract: The invention belongs to the field of information safety, and relates to a compression encryption method for a big data file. Because the big data file is large in data size and the total calculationburden of encryption is too large to complete, the method enables an original plaintext to be stored so as to reduce the reading and writing of data, especially the writing, achieves the covering of apart of encrypted plaintext, and enables a compressed and encrypted ciphertext to be stored independently. Different encryption methods have different advantages and disadvantages, the fully homomorphic encryption cannot solve a problem of all computing entrustment and is large in cost, some entrustment needs the encryption with a misguide function and other entrustment needs the general symmetric encryption, so an encryption method with the proper segmentation is selected according to the needs, and only a part of data is encrypted through a rule or selection. Meanwhile, an optimal scheme for reducing the secret key management and guaranteeing the safety is proposed, and the encryption and decryption of a file just need fewer secret keys. Meanwhile, the compression is introduced before the encryption, so as to reduce a data storage space, to reduce the calculation burden of encryption, and to improve the safety.