ENAES CCSA to preserve confidentiality of outsourced data in public cloud

Abstract

Cloud storage must be secured for maintaining the confidentiality of data. To maintain the confidentiality, many researchers suggested cryptographic techniques to protect data against malevolent attackers in order to preserve data confidentiality. It is observed from various studies, a groundbreaking security system is required to maintain cloud data confidentiality, as the existing techniques are not adequate to protect data stored in Cloud storage. This paper proposes a Cryptographic Cloud Storage Algorithm (CCSA) namely, Enhanced Advanced Encryption Standard (EnAES) to ensure confidentiality of cloud stored data. The proposed CCSA is a symmetric encryption algorithm with data partition and data shuffling mechanisms. Same keys are used to encrypt and decrypt the data. Keys for EnAES CCSA are generated from cloud. EnAES CCSA takes less time for encrypting and decrypting date when compared to the existing AES algorithm. EnAES allows users to encrypt data with high security. The dynamic_S-box of Enhanced_substitute stage enhances the security level in the proposed CCSA. The Enhanced_MixColumns stage helps to reduce the execution time. Ciphertext produced by EnAES CCSA is not easily hacked by the illegitimate users. It confuses the cryptanalyst to get the original ciphertext as there are three mechanisms: data partition, data shuffling and encryption incorporated.