Ecient Dynamic Group Signature Scheme with Verier Loc

Ecient Dynamic Group Signature Scheme with Verier Loc

Lattice based cryptography; dy-
namic group signatures; verier local revocation;
time bound keys

Revocation is an important feature of
group signature schemes. Verier Local Revoca-
tion (VLR) is a popular revocation mechanism
that involves only veriers in the revocation
process. In VLR, a revocation list is maintained
to store the information about revoked users.
The verication cost of VLR based schemes is
linearly proportional to the size of the revoca-
tion list. In many applications, the size of the
revocation list grows with time, which makes the
verication process expensive. In this paper, we
propose a lattice based dynamic group signature
using VLR and time bound keys to reduce
the size of the revocation list to speed up the
verication process. In the proposed scheme, an
expiration date is xed for signing key of each
group member, and veriers can nd out (at
constant cost) if a signature is generated using
an expired key. Hence revocation information
of members who are revoked before signing key
expiry date (premature revocation) are kept in
the revocation list, and other members are part
of natural revocation. This leads to a signicant
saving on the revocation check by assuming
natural revocation accounts for a large fraction
of the total revocation. This scheme also takes
care of non-forgeability of signing key expiry
date.

Abhilash M H,B B Amberker

www.ijcit.com

March 2021

peri irawan

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