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• W64264477 abstract "Third parties are very common in modern cryptography, both in symmetric cryptographic applications (e.g., a key distribution protocol and a non-repudiation protocol) and public key cryptographic systems (e.g., the certificate authority and the private key generator in identity-based cryptography). A widely used approach is to assume that a third party has a certain level of trust, but is not fully trusted. In this thesis, we present several new results about cryptosystems, which do not require any fully trusted third party. We provide detailed schemes and security analysis on server-aided verification signatures, certificate-based signatures and encryption, and optimistic fair exchange. The computational cost required by cryptographic protocols is a significant burden to power-constrained devices such as smart cards and mobile terminals. Serveraided computation is a promising solution to mitigate this issue by employing a powerful server to carry out costly cryptographic computation. Such techniques require an additional care since servers cannot be fully trusted. In this thesis, we investigate the issues of server-aided verification signatures, i.e., using server(s) to assist signature verification. Several notions in digital signatures with server-aided verification are formally defined, based on different trust levels of the server. As instances, we provide server-aided verification protocols for Boneh-Lynn-Shacham (BLS) signature (with the random oracle assumption) and Waters signature (without the random oracle assumption). As cryptographic primitives, certificate-based public key cryptography (CB-PKC) and certificateless public key cryptography (CL-PKC) are used to ease certificate management and solve key escrow problems due to the trust third party in identitybased public key cryptography. As one of features, the signature verification (resp. encryption) does not require public key authenticity check. In this thesis, we take a closer look at the relationship between certificateless cryptosystem and certificatebased cryptosystem, present the security definitions of certificate-based signatures" @default.
• W64264477 created "2016-06-24" @default.
• W64264477 creator A5027626829 @default.
• W64264477 date "2011-01-01" @default.
• W64264477 modified "2023-09-27" @default.
• W64264477 title "Cryptographic protocols involving partially trusted third parties" @default.
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• W64264477 hasPublicationYear "2011" @default.
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