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In case of no TLS/SSL available, why can't I use the hash of the password (SHA512) as the key to encrypt the password to send through the network ?
Beside the MITM attacks, can I prevent any brute force or dictionary attacks using complex and long password ?
Then you still want Diffie–Hellman http://en.wikipedia.org/wiki/Diffie%E2%80%93Hellman_key_exchange, which is the exchange of information in the face of the enemy.
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