1970-01-01

(2025-12) A note on ''a fully dynamic multi-secret sharing scheme with redundant authorization''

• [[Zhengjun Cao]]
• [[Lihua Liu]]

2025-12-28

• #cryptography
• #paper

Abstract

We show that the secret sharing scheme [Cryptogr. Commun. 16(1): 3-20 (2024)] cannot be put into practice. (1) It confused the elements in a residue class ring modulo a prime $p$ with the points in an elliptic curve group over the finite field $F_p$. (2) It confused the underlying elliptic curve with the Lagrange interpolating curve, and falsely requires the interpolating polynomial to map a point on the elliptic curve to another point on the same elliptic curve. (3) It misuses the bit-wise XOR operator for the operands with unequal bit-length, which results in the exposure of any participant's share, and the loss of confidentiality.