Exclusive key sharing method
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United States of America Patent
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Nov 2, 2004
Grant Date -
N/A
app pub date -
Aug 24, 2000
filing date -
Dec 25, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a set-up phase, the base station formulates the secret key S and holds it in secret. The secret information Si which are obtained by dividing the secret key S are distributed in secret to respective terminals 1 to 5 by using cryptographic communication means. In a preparatory phase, the base station 0 broadcasts the preparatory information C1(=g.sup.k modp), the exclusive information C2(=y5.sup.k modp), the ciphertext C3(=M.times.K modp), and the particular terminal number 5 to all terminals. In a key sharing phase, the terminal 1 calculates a product of C1 (.lambda.(1, .LAMBDA.) modq) modp and C2 (.lambda.(5, .LAMBDA.) modq) modp by using the preparatory information C1 and the exclusive information C2 to obtain K and then calculates M, which are common data to the base station 0, by dividing the ciphertext C3 by K. The terminals 2 to 4 execute similar calculations. As a result, the terminals 1 to 4 can share mutually the common data M.
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