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IEICE TRANSACTIONS on Fundamentals

Revisiting the Orthogonal Lattice Algorithm in Solving General Approximate Common Divisor Problem

Xiaoling YU, Yuntao WANG, Chungen XU, Tsuyoshi TAKAGI

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Summary :

Due to the property of supporting arbitrary operation over the encrypted data, fully homomorphic encryption (FHE) has drawn considerable attention since it appeared. Some FHE schemes have been constructed based on the general approximate common divisor (GACD) problem, which is widely believed intractable. Therefore, studying the GACD problem's hardness can provide proper security parameters for these FHE schemes and their variants. This paper aims to study an orthogonal lattice algorithm introduced by Ding and Tao (Ding-Tao algorithm) to solve the GACD problem. We revisit the condition that Ding-Tao algorithm works and obtain a new bound of the GACD samples' number based on geometric series assumption. Simultaneously, we also give an analysis of the bound given in the previous work. To further verify the theoretical results, we conduct experiments on Ding-Tao algorithm under our bound. We show a comparison with the experimental results under the previous bound, which indicates the success probability under our bound is higher than that of the previous bound with the growth of the bound.

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E105-A No.3 pp.195-202
Publication Date
2022/03/01
Publicized
2021/12/07
Online ISSN
1745-1337
DOI
10.1587/transfun.2021CIP0021
Type of Manuscript
Special Section PAPER (Special Section on Cryptography and Information Security)
Category

Authors

Xiaoling YU
  Taiyuan University of Technology
Yuntao WANG
  Japan Advanced Institute of Science and Technology
Chungen XU
  Nanjing University of Science and Technology
Tsuyoshi TAKAGI
  The University of Tokyo

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