Appeal 2007-2437
Application 09/816,080
BACKGROUND
Appellant’s invention relates to a key agreement method in secure
communication system using multiple access method. An understanding of
the invention can be derived from a reading of exemplary claim 1, which is
reproduced below.
1. A key agreement method for secure communication in a multiple
access system, the key agreement method comprising the steps of:
(a) a first user encoding a signal from a source by a bit sequence and
transmitting the signal;
(b) a second user who is a legitimate counterpart of the first user
decoding the transmitted signal and measuring the decoded signal;
(c) the second user adopting only bits, on a bit-by-bit basis, having the
measured value beyond the threshold value which is predetermined;
(d) the second user informing the first user that the bits adopted are
the n-th bits in the transmitted bit sequence, not telling the values of
the bits; and
(e) the first and second users taking the adopted bits as a key string,
and discarding the remaining bits.
PRIOR ART
The prior art reference of record relied upon by the Examiner in
rejecting the appealed claims is:
Mayers US 6,678,379 B1 Jan. 13, 2004
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