다중-요소 비밀 공유를 위한 지분 강화 기법

초록

Conventional secret sharing techniques often derive shares from randomly generated polynomials or planes, resulting in lengthy andcomplex shares that are challenging to memorize and/or manage without the aid of a separate computer or specialized device. Modifyingexisting secret sharing methods to use a predetermined value, such as a memorizable password or bio-metric information, offers a solution. However, this approach raises concerns about security, especially when the predetermined value lacks randomness or has low entropy. In such cases, adversaries may deduce a secret S with just (t - 1) shares by guessing the predetermined value or employing brute forceattacks. In this paper, we introduce a share hardening method designed to ensure the security of secret sharing while enabling the useof memorizable passwords or biometric information as predetermined shares.

키워드