To prevent man-in-the-middle attack, Diffie-Hellman first proposed the concept of the session key exchange protocol, in which the author remove the long term keying material at the end of the session. In our scheme, we apply the session key concept of Diffie-Hellman for cloud computing in the presence of the Trusted Third Party (TTP). Our proposed scheme provides SEVEN security properties by using the session key exchange protocols as symmetric. In our scheme, TTP becomes free from a burden of activities, like to encrypt the requests (R_i) of the Cloud Service Users (CSUs) and to decrypt the services (S_i) of the Cloud Service Providers (CSPs) again and again. By using S Performance (EP) for Elliptic Curve Point Multiplication (ECPM), Hash (H), Inversion (Inv), Exclusive oR (XoR), Encryption (Enc), and Decryption (Dec) is (87.5%, 62.5%, 57.14%), (87.5% and 75%), (75%), (97.82% and ≤ 1%), (92.85%) and (50%) respectively. The security requirements of our scheme are; data integrity, data confidentiality, authenticity, non-repudiation, forward secrecy, unforgeability, and untraceability. Our proposed scheme also outperformed performance in terms of flexibility, reliability, and efficiency as compared to existing schemes.

为了防止中间人攻击，Diffie-Hellman首先提出了会话密钥交换协议的概念，其中作者在会话结束时删除了长期的密钥材料。在我们的方案中，我们在可信第三方（TTP）存在的情况下将Diffie-Hellman的会话密钥概念应用于云计算。我们提出的方案通过使用对称的会话密钥交换协议提供了七个安全属性。在我们的方案中，TTP摆脱了繁重的工作，例如一次又一次地加密云服务用户（CSU）的请求（R _i）和解密云服务提供商（CSP）的服务（S _i）。 。通过将S性能（EP）用于椭圆曲线点乘法（ECPM），哈希（H），反演（Inv），互斥oR（XoR），加密（Enc）和解密（Dec）为（87.5％，62.5％，57.14％），（87.5％和75％），（75％），（97.82） ％和≤1 ％），（92.85％）和（50％）。我们计划的安全性要求是：数据完整性，数据机密性，真实性，不可否认性，前向机密性，不可伪造性和不可追溯性。与现有方案相比，我们提出的方案在灵活性，可靠性和效率方面也胜过性能。