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A New Forward-Secure Digital Signature Scheme
Authors: Michel Abdalla, Leonid ReyzinAbstract:
We improve the Bellare-Miner (Crypto '99) construction of signature
schemes with forward security in the random oracle model. Our scheme
has significantly shorter keys and is, therefore, more practical. By
using a direct proof technique not used for forward-secure schemes
before, we are able to provide better security bounds for the original
construction as well as for our scheme.
Bellare and Miner also presented a method for constructing such schemes
without the use of the random oracle. We conclude by proposing an
improvement to their method and an additional, new method for accomplishing
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