Performance evaluation of a new hybrid encryption protocol for authentication and key distribution

Weaknesses in EHA Authentication and Key Distribution Protocol

“…This module is exeeuted when two principals A and B want to communicate seeurely. The symmetrie key K is eomputed as a XY mod p. The goals of the module are (as stated in [EHA98]):…”

“…The BAN logic analysis performed in [EHA98] deals only with the authentication and key distribution module. Therefore, initial assumptions in the analysis are based on the correctness and security of the setup and the login modules.…”

“…Recently, a new protocol for authentication and key distribution has been presented ( [EHA98]). In this paper it will be referred to as EHA.…”

“…B computes key K = (a X modp)Y modp and verifies the second part of the received message. A performs an additional check (using nonce NA) after step 5 of this module.The BAN logic analysis performed in[EHA98] yielded the following results (described in the BAN logic syntax):So, principal A believes that K is a good key for communication with B and B believes that K is a good key for communication with A. Moreover, A believes that B believes in "goodness" of K and vice-versa.…”

AUTHMAC_DH: A New Protocol for Authentication and Key Distribution

“…The new protocol, which is named AUTHMAC_DH, is based on work done in [7,8] and has the aim to achieve a comparable performance with the Kerberos protocol and overcome its drawbacks [9]. The paper is organized as follows: in Section 2, a description of the new protocol is detailed.…”