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The bit commitment system, bit commitment manner, the bit commitment transmitting device and the bit commitment receiving device, bit commitment transmission manner and bit commitment reception manner, information m
The bit commitment system, bit commitment manner, the bit commitment transmitting device and the bit commitment receiving device, bit commitment transmission manner and bit commitment reception manner, information m
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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