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    METHOD AND DEVICE FOR REDUCING AMOUNT OF CALCULATION FOR GENERATING HIERARCHICAL GALOIS KEY SET FOR HOMOMORPHIC ENCRYPTION ROTATION OPERATION
    2.
    发明公开
    METHOD AND DEVICE FOR REDUCING AMOUNT OF CALCULATION FOR GENERATING HIERARCHICAL GALOIS KEY SET FOR HOMOMORPHIC ENCRYPTION ROTATION OPERATION 审中-实审

    公开(公告)号：EP4412143A1

    公开(公告)日：2024-08-07

    申请号：EP24154576.3

    申请日：2024-01-30

    申请人： Seoul National University R & DB Foundation ,  Industry Academic Cooperation Foundation Chosun University

    发明人： NO, Jong Seon ,  LEE, Joon Woo ,  KIM, Young Sik

    IPC分类号： H04L9/00

    CPC分类号： H04L9/008

    摘要： A server for performing an operation on a homomorphic ciphertext according to an embodiment of the present disclosure may be configured to: receive a first homomorphic ciphertext, a public key, and a first hierarchical Galois key set from a client device; in response to a request for generating a second hierarchical Galois key set for performing a rotation operation on the first homomorphic ciphertext of the client device, generate the second hierarchical Galois key set, based on the received public key and hierarchical Galois key set; and when a decomposition operation for a first Galois key included in the second hierarchical Galois key set overlaps with a decomposition operation for a second Galois key, first perform the decomposition operation for the first Galois key, and then substitute the decomposition operation for the second Galois key with a result of the decomposition operation for the first Galois key. In addition, the second hierarchical Galois key set may be sequentially generated according to a predetermined generation order.