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Multirecipient Encryption Schemes: How to Save on Bandwidth and Computation Without Sacrificing Security

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4 Author(s)
Bellare, M. ; California Univ., San Diego ; Boldyreva, A. ; Kurosawa, K. ; Staddon, J.

This paper proposes several new schemes which allow a sender to send encrypted messages to multiple recipients more efficiently (in terms of bandwidth and computation) than by using a standard encryption scheme. Most of the proposed schemes explore a new natural technique called randomness reuse. In order to analyze security of our constructions, we introduce a new notion of multirecipient encryption schemes (MRESs) and provide definitions of security for them. We finally show a way to avoid ad hoc analyses by providing a general test that can be applied to a standard encryption scheme to determine whether the associated randomness reusing MRES is secure. The results and applications cover both asymmetric and symmetric encryption.

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Information Theory, IEEE Transactions on  (Volume:53 ,  Issue: 11 )