IACR paper details
Title | A Tunable Broadcast Encryption Scheme |
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Booktitle | IACR Eprint archive |
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Pages | |
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Year | 2007 |
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URL | http://eprint.iacr.org/2007/329 |
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Author | David Lubicz |
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Author | Thomas Sirvent |
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Abstract |
In this paper, we describe yet another broadcast encryption scheme
for stateless receivers. The main difference between our scheme and
the classical schemes derived from the complete subtree and its
subsequent improvements is that in our scheme the group management
is based upon a more adaptable data structure. In these classical
schemes, users must be spread on a tree structure where each
level of the tree is associated to some distinguishing property of
the users. The fact that the underlying data structure is a fixed
tree is a strong limitation for some applications where an operator
wants to select users very dynamically following criterions with
changing levels of priority. Our scheme may be thought as if in the
complete subtree it would be possible to exchange the different
level of the tree in order to make it very efficient to revoke or
select a class of users. It is also very efficient in the cases
where there exists very unbalanced groups of users.
This scheme allows one to select or revoke users by sending
ciphertexts of linear size with respect to the number of groups
which is in general far less than the number of users. Moreover, by
using a specific group repartition, it is possible to recover a tree
structure in order to apply the classical methods which guarantee
that our scheme is in general as efficient as a usual ones.
We prove that our scheme is fully collusion secure in the generic
group with pairing model. |
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Search for the paper
@misc{eprint-2007-13609,
title={A Tunable Broadcast Encryption Scheme},
booktitle={IACR Eprint archive},
keywords={cryptographic protocols /},
url={http://eprint.iacr.org/2007/329},
note={ david.lubicz@univ-rennes1.fr 13745 received 20 Aug 2007},
author={David Lubicz and Thomas Sirvent},
year=2007
}
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