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BIT COMMITMENT SYSTEM, BIT COMMITMENT METHOD, BIT COMMITMENT TRANSMITTING DEVICE, BIT COMMITMENT RECEIVING DEVICE, BIT COMMITMENT TRANSMITTING METHOD, BIT COMMITMENT RECEIVING METHOD, AND BIT COMMITMENT PROGRAM
BIT COMMITMENT SYSTEM, BIT COMMITMENT METHOD, BIT COMMITMENT TRANSMITTING DEVICE, BIT COMMITMENT RECEIVING DEVICE, BIT COMMITMENT TRANSMITTING METHOD, BIT COMMITMENT RECEIVING METHOD, AND BIT COMMITMENT PROGRAM
PROBLEM TO BE SOLVED: To provide a non-interactive and multiple bit commitment type bit commitment system.;SOLUTION: This bit commitment system comprises: a transmitting device for transmitting information (m); a receiving device; and a public opening device. The public opening device opens common reference information (crs) including function indexes (s) of ABO-TDF to the public. The transmitting device is provided with: a signature creating part for obtaining cO using the ABO-TDF from the function index (s) and a random number (ra) with a verification key (vk) as a loss branch, randomizing cO using a random number (rb) to generate c1, obtaining c2 from a random number (ra) and the information (m), and creating a signature from c1 and c2 using a signature key (sk); and a commitment creating part for creating a commitment (com) including c1, c2 and . The receiving device is provided with a commitment verifying part for verifying the commitment (com) by using the common reference information (crs) and opening information M.;COPYRIGHT: (C)2010,JPO&INPIT
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