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In this paper, we introduce the notion of verifiably encrypted cascade-instantiable blank signatures (CBS) in a multi-user setting. In CBS, there is a delegation chain that starts with an originator and is followed by a sequence of proxies. The originator creates and signs a template, which may comprise fixed fields and exchangeable fields. Thereafter, each proxy along the delegation chain is able...
A group signature scheme allows a group member of a given group to sign messages on behalf of the group in an anonymous and unlinkable fashion. In case of a dispute, however, a designated group manager can reveal the signer of a valid group signature. Based on the Camenisch-Michels group signature scheme [7,8], Kim, Lim and Lee proposed the first group signature scheme with a member deletion procedure...
Signcryption is a new cryptographic primitive that performs signing and encryption simultaneously, at a cost significantly lower than that required by the traditional signature-then-encryption approach. In this paper, we present a security analysis of two such schemes: the Huang-Chang convertible signcryption scheme [12], and the Kwak-Moon group signcryption scheme [13]. Our results show that both...
JPEG2000 is an emerging international standard for still image compression and is becoming the solution of choice for many digital imaging fields and applications. Part 8 of the standard, named JPSEC, is concerned with all the security aspects of JPEG2000 image code-streams, with emphasis presently on access control and authentication. An important aspect of JPEG2000 is its “compress once, decompress many ways”...
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