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Published in:
2011 | OriginalPaper | Chapter
Achieving Short Ciphertexts or Short Secret-Keys for Adaptively Secure General Inner-Product Encryption
Authors : Tatsuaki Okamoto, Katsuyuki Takashima
Published in: Cryptology and Network Security
Publisher: Springer Berlin Heidelberg
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In this paper, we present two
non-zero inner-product
encryption (NIPE) schemes that are
adaptively secure
under a standard assumption, the decisional linear (DLIN) assumption, in the standard model. One of the proposed NIPE schemes features
constant-size ciphertexts
and the other features
constant-size secret-keys
. Our NIPE schemes imply an identity-based revocation (IBR) system with constant-size ciphertexts or constant-size secret-keys that is adaptively secure under the DLIN assumption. Any previous IBR scheme with constant-size ciphertexts or constant-size secret-keys was
not adaptively secure
in the standard model. This paper also presents two zero inner-product encryption (ZIPE) schemes each of which has constant-size ciphertexts or constant-size secret-keys and is adaptively secure under the DLIN assumption in the standard model. They imply an identity-based broadcast encryption (IBBE) system with constant-size ciphertexts or constant-size secret-keys that is adaptively secure under the DLIN assumption.