Cryptography – Key management – Key distribution
Reexamination Certificate
2001-03-26
2008-03-25
Vu, Kim (Department: 2135)
Cryptography
Key management
Key distribution
C380S001000, C380S044000, C380S045000, C380S046000, C380S047000, C380S277000, C380S278000, C380S028000
Reexamination Certificate
active
07349545
ABSTRACT:
A key agreement method for secure communication in a multiple access system is provided.A key agreement method for secure communication in a multiple access system, the key agreement method includes the steps of (a) a first user, modulating signals from a source by a bit sequence and transmitting the modulated signal, (b) a second user, a legitimate counterpart of the first user, decoding, making decision for each bit of the signal with a detector affected by noise and recording the measured values, (c) the second user, deciding a threshold value of measurement with consideration of other factors such as a transmission rate, tolerable error rates, and a degree of security, (d) the second user adopting as a key string only bits having values beyond the threshold value and ignoring bits falling the erroneous region below the threshold, (e) the second user informing the first user that the n-th bit is adopted, not telling the value of the bit, and (f) the users, the first user and the second user, taking as a key string the values of the n-th bits adopted in (e), and discarding the values of the other bits.
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Dada Beemnet W
Vu Kim
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