KEY AGREEMENT AND CARRIER METHOD USING IMPLICIT SIGNING

摘要

PROBLEM TO BE SOLVED: To generate a session key in two communication terminals so as to cope with unauthorized wiretapping.;SOLUTION: In the communication terminal A, a random integer x is selected, an exponential function f(α)^g(x) is provided (α is a generation source), and a signing s_A is generated from the random integer x, the exponential function f(α)^g(x) and a private key a. In the communication terminal B, a random integer y is selected, another exponential function f'(α)^g(y) is provided, and a signing s_B is generated from the random integer y, the exponential function f'(α)^g(y) and a private key b. The communication terminals A and B transmit a message, including the exponential function f(α)^g(x) and the exponential function f'(α)^g(y) to the communication terminals B and A each. In the communication terminals A and B, each constructs the session key K by exponent-numbering information respectively disclosed by the communication terminals B and A, by using confidential information which belongs to the communication terminals A and B.;COPYRIGHT: (C)2010,JPO&INPIT