Sökning: "Cryptography"

Visar resultat 1 - 5 av 45 avhandlingar innehållade ordet Cryptography.

1. 1. Some Notes on Post-Quantum Cryptanalysis

   Författare :Erik Mårtensson; Institutionen för elektro- och informationsteknik; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Cryptography; Post-quantum cryptography; LWE; BKW; Cryptanalysis; Lattice sieving; SVP; Lattice-based cryptography; Code-based cryptography;

   Sammanfattning : Cryptography as it is used today relies on a foundational level on the assumptionthat either the Integer Factoring Problem (IFP) or the DiscreteLogarithm Problem (DLP) is computationally intractable. In the 1990s PeterShor developed a quantum algorithm that solves both problems in polynomialtime. LÄS MER

3. 2. Decryption Failure Attacks on Post-Quantum Cryptography

   Författare :Alexander Nilsson; Institutionen för elektro- och informationsteknik; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Post-quantum cryptography; Code-based cryptography; Lattice-based cryptography; side-channel attack;

   Sammanfattning : This dissertation discusses mainly new cryptanalytical results related to issues of securely implementing the next generation of asymmetric cryptography, or Public-Key Cryptography (PKC).PKC, as it has been deployed until today, depends heavily on the integer factorization and the discrete logarithm problems. LÄS MER

4. 3. Logics of Knowledge and Cryptography : Completeness and Expressiveness

   Författare :Mika Cohen; Mads Dam; Alessio Lomuscio; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; epistemic logic; first-order logic; formal cryptography; static equivalence; security protocols; BAN logic; multi-agent system; completeness; logical omniscience problem; Computer science; Datavetenskap;

   Sammanfattning : An understanding of cryptographic protocols requires that we examine the knowledge of protocol participants and adversaries: When a participant receives a message, does she know who sent it? Does she know that the message is fresh, and not merely a replay of some old message? Does a network spy know who is talking to whom? This thesis studies logics of knowledge and cryptography. Specifically, the thesis addresses the problem of how to make the concept of knowledge reflect feasible computability within a Kripke-style semantics. LÄS MER

5. 4. Two topics in cryptography : lattice problems and the security of protocols

   Författare :Mårten Trolin; Johan Håstad; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Datalogi; Datalogi; Computer science; Datalogi;

   Sammanfattning : In this thesis we present new results in two areas – cryptographic protocols and lattice problems. • We present a new protocol for electronic cash which is designed to function on hardware with limited computing power. The scheme has provable security properties and low computational requirements, but it still gives a fair amount of privacy. LÄS MER

7. 5. Cryptographic Tools for Privacy Preservation

   Författare :Carlo Brunetta; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Outsourced Computation; Verifiability; Cryptography; Privacy; Cloud Computing;

   Sammanfattning : Data permeates every aspect of our daily life and it is the backbone of our digitalized society. Smartphones, smartwatches and many more smart devices measure, collect, modify and share data in what is known as the Internet of Things. LÄS MER