Abstract
Man in the middle Attack (MIMA) problem of Diffie-Hellman key exchange (D-H) protocol, has led to introduce the Hash Diffie-Hellman key exchange (H-D-H) protocol. Which was cracked by applying the brute force attack (BFA) results of hash function. For this paper, a system will be suggested that focusses on an improved key exchange (D-H) protocol, and distributed transform encoder (DTE). That system utilized for enhanced (D-H) protocol algorithm when (D-H) is applied for generating the keys used for encrypting data of long messages. Hash256, with two secret keys and one public key are used for D-H protocol improvements. Finally, DTE where applied, this cryptosystem led to increase the efficiency of data transfer security with strengthening the shared secret key code. Also, it has removed the important problems such as MITM and BFA, as compared to the previous work.
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