Özet:

Technology advancement and quick progressing have become vital in recent years. Cloud technology is one among them which has rapid growth in various domains. But a serious concern is data privacy and data security of the valuable data stored in cloud storage. The main reason for this untrustworthiness is Cloud Service Provider (CSP) because CSP is a third-party vendor. In this research work, double encryption algorithm using SHA256 with RSA known as DS-SHA256 is proposed. A double digital signature scheme was introduced in the proposed system. It achieves enhanced security with minimum consumption considering the existing works. To prove the efficiency of the proposed DS-SHA256, comparison work is carried out between the existing RSA and AES. The obtained result proved that the proposed DS-SHA256 security level and overall performance are far better than the others. Keywords: Encryption, Decryption, RSA, AES, Cloud technology, Cloud Service Provider (CSP)

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