Study of Local Linkability based on Modified Linear Encryption in Group Signature Schemes
Jeonil Kang, Kitae Kim, DaeHun Nyang, Kyung-Hee Lee · Information Security and Cryptology · 2012
Group signature schemes were made for serving anonymities of signers, but the group signature schemes have been seldomly adapted to the real-world applications because of their low computation and space (i.e. signature length) efficiency, complicated construction, limited user management, and so on. Kang, Hwang, etc. performed the study about the local linkability that is for helping group signature schemes to be adapted more easily to the real world. In this paper, we investigate the nature of local linkability, which did not deal with well in the previous studies, in detail and perform the formal proof for the security of special entities who hold the local linkability.