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Authenticated Hybrid Encryption for Multiple Recipients
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Abstract: | Authenticated encryption schemes used in order to send one message to one recipient have received considerable attention in the last years. We investigate the case of schemes, we call authenticated $\mathtt{1{\to}n}$ schemes, that allow one to encrypt efficiently in a public-key setting a message for several, say $n$, recipients in an authenticated manner. We propose formal security definitions for such schemes that work also for $n=1$ and which are stronger and/or more general than those currently proposed. We then present a flexible mode of operation that transforms any $\mathtt{1{\to}1}$ authenticated encryption scheme working on small messages into a $\mathtt{1{\to}n}$ authenticated encryption scheme working on longer messages. We show that it allows the construction of efficient $\mathtt{1{\to}n}$ schemes that are proved secure for the strongest security notion. |
BibTeX
@misc{eprint-2006-21522, title={Authenticated Hybrid Encryption for Multiple Recipients}, booktitle={IACR Eprint archive}, keywords={public-key cryptography / Public key encryption, Authentication,}, url={http://eprint.iacr.org/2006/029}, note={ s.alt@free.fr 13172 received 24 Jan 2006}, author={Stéphanie Alt}, year=2006 }