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Title:
A Shorter Group Signature with Verifier-Location Revocation and Backward Unlinkability
Authors: Zhou Sujing, Lin Dongdai
Abstract:Group signatures are generalized credential/member authentication
schemes with wide applications, such as Trust Computing.
Membership revocation problem is a major issue of group
signatures. In some applications that group secret keys are stored
in tamper resistant chips, a Verifier-Local Revocation resolution
is more reasonable than other methods, such as witness based
revocation.
Boneh et al. formally defined such VLR group signatures and
proposed a VLR resolution for a short group signature. Later
Nakanishi et al. pointed out it has a disadvantage of backward
linkability, and provided a VLR resolution with backward
unlinkability at the cost of longer signature size and more
computation.
We improve Nakanishi et al.'s scheme by reducing the signature
size and computations required, without compromising VLR and
backward unlinkability.
ePrint: https://eprint.iacr.org/2006/100
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