公开(公告)号：US20190260715A1

公开(公告)日：2019-08-22

申请号：US16276798

申请日：2019-02-15

Applicant: Hitachi, Ltd.

Inventor： Takayuki SUZUKI ,  Toshirou YAMAYOSHI ,  Hisayoshi SATO ,  Masayuki YOSHINO ,  Ken NAGANUMA ,  Dai WATANABE

IPC: H04L29/06 ,  H04L9/06 ,  G06F16/2455 ,  H04L9/30 ,  G06F17/18

Abstract: A computer system includes a plurality of processing nodes constituting a blockchain network and a connection apparatus connecting to the blockchain network. The processing node holds information. The connection apparatus includes a connection processing unit that transmits a transaction to the processing node. The connection processing unit includes an encryption processing unit that generates searchable ciphertext from a keyword based on a probabilistic encryption method. The encryption processing unit generates, from the keyword, the searchable ciphertext to be used as an address indicating a transmission source or a transmission destination of the transaction, and generates the transaction including the searchable ciphertext.