TY - GEN
T1 - Public-Key Watermarkable PRFs with Dynamic Bounded Collusion
AU - Yu, Siyuan
AU - Zhu, Ziqi
AU - Yang, Rupeng
AU - Gong, Junqing
N1 - Publisher Copyright:
© The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.
PY - 2025
Y1 - 2025
N2 - Previous watermarking schemes supporting collusion resistance required the collusion bound q to be declared at setup time, which implied q would be fixed for the system’s entire lifetime. To improve this, we introduce a new flexible corruption model called “dynamic collusion model”, which dynamically decides the collusion bound for each encryption. Based on this, we construct the first public-key watermarking pseudorandom function (PRF) with dynamic collusion bounded. Technically, we first construct an intermediate PRF called “hinting watermarkable PRF” which requires a “hint” about the watermarked PRF key to help extract the embedding message. In our work, we construct a public-key hinting watermarkable PRF from dynamic collusion bounded functional encryption which supports the dynamic collusion model. Applying Yang et al.’s framework in [YYAS22], we can upgrade hinting watermarkable PRF to standard watermarkable PRF.
AB - Previous watermarking schemes supporting collusion resistance required the collusion bound q to be declared at setup time, which implied q would be fixed for the system’s entire lifetime. To improve this, we introduce a new flexible corruption model called “dynamic collusion model”, which dynamically decides the collusion bound for each encryption. Based on this, we construct the first public-key watermarking pseudorandom function (PRF) with dynamic collusion bounded. Technically, we first construct an intermediate PRF called “hinting watermarkable PRF” which requires a “hint” about the watermarked PRF key to help extract the embedding message. In our work, we construct a public-key hinting watermarkable PRF from dynamic collusion bounded functional encryption which supports the dynamic collusion model. Applying Yang et al.’s framework in [YYAS22], we can upgrade hinting watermarkable PRF to standard watermarkable PRF.
KW - Collusion Resistance
KW - Functional Encryption
KW - Pseudorandom Function
KW - Watermarking
UR - https://www.scopus.com/pages/publications/105005252982
U2 - 10.1007/978-981-96-4731-6_21
DO - 10.1007/978-981-96-4731-6_21
M3 - 会议稿件
AN - SCOPUS:105005252982
SN - 9789819647309
T3 - Lecture Notes in Computer Science
SP - 427
EP - 443
BT - Information Security and Cryptology - 20th International Conference, Inscrypt 2024, Revised Selected Papers
A2 - Lin, Dongdai
A2 - Wang, Meiqin
A2 - Yung, Moti
PB - Springer Science and Business Media Deutschland GmbH
T2 - 20th International Conference on Information Security and Cryptology, Inscrypt 2024
Y2 - 14 December 2024 through 16 December 2024
ER -