Paper 2006/029

Authenticated Hybrid Encryption for Multiple Recipients

Stéphanie Alt

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.

Metadata
Available format(s)
PDF PS
Category
Public-key cryptography
Publication info
Published elsewhere. Unknown where it was published
Keywords
Public key encryptionAuthentication
Contact author(s)
s alt @ free fr
History
2006-01-27: received
Short URL
https://ia.cr/2006/029
License
Creative Commons Attribution
CC BY

BibTeX

@misc{cryptoeprint:2006/029,
      author = {Stéphanie Alt},
      title = {Authenticated  Hybrid Encryption for Multiple Recipients},
      howpublished = {Cryptology ePrint Archive, Paper 2006/029},
      year = {2006},
      note = {\url{https://eprint.iacr.org/2006/029}},
      url = {https://eprint.iacr.org/2006/029}
}
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