Proposal of a DH optimization model

The Diffie-Hellman (DH) algorithm aims to allow two users who don't know each other before to jointly establish a shared secret key over an insecure communications channel. The DH itself is limited to the exchange of keys and since there is no mechanism which ensures the main security services such as confidentiality, integrity and authentication, the DH algorithm is therefore not immune to "man in the middle" attacks. In this article, we propose a hybrid model called S-SEJAD which combines cryptographic algorithms, DH and AES-128. The S-SEJAD model aims to improve security when exchanging keys with DH algorithm. The results show the effectiveness of strategies applied under the proposed model. Indeed, S-SEJAD outperforms the S-Wane model in time a real improvement over existing solutions such as New-two-Pass, STS and HMQV.