Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"Signature Scheme"”.
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Security of Unbalanced Oil-Vinegar Signature Scheme
<p>We explore ideas for oil-vinegar signature schemes in the multivariate polynomialcryptography.</p><p>In the first half, we focus on TTS (Tame Transformation Signature) systems. We find a structure attack to defeat a family of TTS systems. Then we have the related complexity analysis to claim …
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Signature schemes and applications to cryptographic protocol design
Signature schemes are fundamental cryptographic primitives, useful as a stand-alone application, and as a building block in the design of secure protocols and other cryptographic objects. In this thesis, we study both the uses that signature schemes find in protocols, and the design of signature …
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Functional signatures
… thesis, we introduce the notion of functional signatures. In a functional signature scheme, in addition to a master signing key that can be used to sign any message, there are signing keys for a function f, which allow one to sign any message in the range of f. An immediate application of …
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End-to-end security mechanisms for the optimized link state routing protocol for wireless ad hoc networks
… we investigate the use of a one-time signature scheme known as Hash to Obtain Random Subset (HORS), as well as an extended version of HORS, as a broadcast digital signature for OLSR messages. For the experimental purposes of this study, an existing OLSR implementation was used as a …
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Performance Optimization of Public Key Cryptography on Embedded Platforms
… communication energy requirements for different signature schemes, each with a different trade-off between computation and communication. We investigate the Elliptic Curve Digital Signature Algorithm (ECDSA), the Lamport-Diffie one-time hash-based signature scheme (LD-OTS) and the Winternitz …
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Authentication in a reconfigurable Byzantine fault tolerant system
… Any party that knows a public key can verify the signature. Such a scheme is a threshold signature scheme. The signers in a threshold signature scheme each know some part of a secret. Because we would like to reconfigure the system, we need to transfer the knowledge of the secret to the new …
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Deniable Ring Signatures
Ring Signatures were developed by Rivest, Shamir and Tauman, in a paper titled How to Leak a Secret, as a cryptographically secure way to authenticate messages with respect to ad-hoc groups while still maintaining the signer's anonymity. While their initial scheme assumed the existence of random …
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Advances in signatures, encryption, and E-Cash from bilinear groups
… of algebraic group called bilinear groups. 1. Re-Signatures: We present the first public key signature scheme where a semi-trusted proxy, given special information, can translate Alice's signature on a message into Bob's signature on the same message. The special information, however, allows …
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Increasing the Legal Probative Value of Cryptographically Private Malleable Signatures
… digitalen Signaturverfahren (private malleable signature schemes oder MSS) zur Erlangung möglichst hoher rechtlicher Evidenz. Im Recht werden bestimmte kryptographische Algorithmen, Schlüssellängen und deren korrekte organisatorische Anwendungen zur Erzeugung elektronisch signierter Dokumente …
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Content-based image indexing and retrieval for visual information systems
… and the developments of Composite Bitplane Signatures with Inverted Image Indexing and Compression are the main contributions to this dissertation. These paradigms are analogous to the signature-based indexing and inversion-based postings for text information retrieval. We formulate the …
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Efficient threshold cryptosystems
A threshold signature or decryption scheme is a distributed implementation of a cryptosystem, in which the secret key is secret-shared among a group of servers. These servers can then sign or decrypt messages by following a distributed protocol. The goal of a threshold scheme is to protect the …
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Ensuring reliable and secure deployment of emergent workloads on modern microprocessors
… spurred the development of new cryptographic schemes that base their security on mathematical problems which remain hard even on a quantum computer. A now-finished NIST-led standardization process for post-quantum secure cryptographic algorithms has led to the standardization of three …
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Code-Based Digital Signature Schemes: Construction, Cryptanalysis and Theoretical Foundations
In recent decades, numerous code-based digital signature schemes following the hash&sign paradigm have been proposed, often turning out to be insecure and demonstrating that the cryptographic community still seems far from a satisfactory solution in this area. The first major question we pose in …
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Rate-1 non-interactive arguments for batch-NP
… an incrementally verifiable computation (IVC) scheme for arbitrary deterministic computations, even beyond P; a multi-hop BARG scheme for NP; and a multi-hop aggregate signature scheme, in the standard model, with unbounded and universal aggregation. Prior to this work, IVC schemes were only …
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Frontiers in Lattice Cryptography and Program Obfuscation
… of a deniable attribute-based encryption scheme from lattices. A deniable encryption scheme is secure against not only eavesdropping attacks as required by semantic security, but also stronger coercion attacks performed after the fact. An attribute-based encryption scheme allows …
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Unclonable Secret Keys
… such as messages, public keys, ciphertexts, signatures, etc., remain classical. We study this model in the authentication and encryption setting giving a plethora of definitions and positive results as well as several applications that are impossible in a purely classical setting.</p> <p>In …
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Cryptographic tools for the cloud
… the Internet using classical encryption and signature algorithms designed and developed over the last decades. However, today we face new security challenges that arise in cloud settings that cannot be solved effectively by these classical algorithms. In this thesis, we address three major …
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Indexing XML Data for Efficient Twig Pattern Matching
… I propose two different XML indexing schemes for efficient query processing.In a traditional environment, a core operation is tofind all occurrences of a given query pattern in the database. I propose a new way of indexing XML documents and processing query patterns. Every XML document …
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Smartphone Privacy in Citizen Science
Group signature schemes enable anonymous-yet-accountable communications. Such a capability is extremely useful for modern applications such as smartphone-based crowdsensing and citizen science. A prototype named GROUPSENSE was developed to support anonymous-yet-accountable crowdsensing with SRBE in …
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