公开(公告)号：US20250023717A1

公开(公告)日：2025-01-16

申请号：US18765390

申请日：2024-07-08

Applicant: NEC Corporation

Inventor： Hikaru TSUCHIDA ,  Takuya HAYASHI ,  Toshiyuki ISSHIKI ,  Kengo MORI ,  Yukimasa SUGIZAKI

IPC: H04L9/08 ,  H04L9/00

Abstract: A distributed re-encryption apparatus comprises: a distributed re-encryption key storage part that stores shares obtained by secret-sharing a re-encryption key that re-encrypts a ciphertext into one encrypted with a different encryption key without decrypting the ciphertext; and a distributed re-encryption part that re-encrypts using the shares of the re-encryption key the ciphertext into one encrypted with a different encryption key without decrypting the ciphertext.