'Signature scheme' diaporamas de présentation

Digital Signature

Digital Signature. Sheng Zhong. Digital Signature (1). Public-key-based technique for data integrity. A digital signature scheme is a tuple (PK, SK, M, S, KG, Sign, Verify). PK: Public key space (the set of all possible keys). SK: Private key space. M: Message space. S: Signature space.

868 views • 46 slides

Digital Signature

Digital Signature. Sheng Zhong. Digital Signature (1). Public-key-based technique for data integrity. A digital signature scheme is a tuple (PK, SK, M, S, KG, Sign, Verify). PK: Public key space (the set of all possible keys). SK: Private key space. M: Message space. S: Signature space.

870 views • 46 slides

Digital Signatures

Digital Signatures. Outline. [1] Introduction [2] Security Requirements for Signature Schemes [3] The ElGamal Signature Scheme [4] Variants of the ElGamal Signature Scheme The Digital Signature Algorithm The Elliptic Curve DSA. [1] Introduction.

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A survey of the server-aided verification models

A survey of the server-aided verification models. Outline. Introduction Survey: GL05 Survey: Wu08 Survey: Wang10 Survey: Wu11 and Wang11 Conclusion. GL05. Wu08. Wang10. Wu11. Wang11. Introduction. ????? 2005 ?? 2012 ?????? server-aided verification (SAV) ????. Outline. Introduction

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Chapter 7-1

Chapter 7-1. Signature Schemes. Outline. [1] Introduction [2] Security Requirements for Signature Schemes [3] The ElGamal Signature Scheme [4] Variants of the ElGamal Signature Scheme The Schnorr Signature Scheme The Digital Signature Algorithm The Elliptic Curve DSA

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COM 5336 Lecture 8 Digital Signatures

COM 5336 Lecture 8 Digital Signatures. Scott CH Huang. COM 5336 Cryptography Lecture 8. Outline. Introduction RSA signature scheme ElGamal signature scheme Rabin public-key signature scheme DSA signature scheme (optional) Rabin one-time signature Arbitrated signature schemes.

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Cross-Domain Secure Computation

Cross-Domain Secure Computation. Chongwon Cho (HRL Laboratories) Sanjam Garg (IBM T.J. Watson) Rafail Ostrovsky (UCLA). Secure Computation [Yao, GMW]. Alice and Bob Alice holds input x . Bob holds input y . Goal : jointly compute F( x,y ) = z Security : after joint computation,

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Signature scheme based on the root extraction problem over braid groups

Signature scheme based on the root extraction problem over braid groups. B.C. Wang, Y.P. Hu IET Information security 2009, Vol 3, Iss 2, pp. 53-59. Outline. Induction Preliminaries The proposed signature scheme Performance and parameter specification Security analysis Conclusion.

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Cryptographic Methods for Storing Ballots on a Voting Machine

Cryptographic Methods for Storing Ballots on a Voting Machine. John Bethencourt Carnegie Mellon University. Dan Boneh Stanford University. Brent Waters SRI International. Outline. Background DRE voting machines Desired properties Previous work History-hiding append-only signatures

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Server-Aided Verification : Theory and Practice

Server-Aided Verification : Theory and Practice. Source: ASIACRYPT 2005, LNCS 3788, pp. 605-623 Author: Marc Girault and David Lefranc Presenter: Chun-Yen Lee. Outline. Introduction Model SAV Protocols for Identification Schemes First SAV Protocols for Pairing-Based Schemes Conclusion.

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Other Public Key Systems

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Multivariate Signature Scheme using Quadratic Forms

Multivariate Signature Scheme using Quadratic Forms. Takanori Yasuda (ISIT) Joint work with Tsuyoshi Takagi (Kyushu Univ.), Kouichi Sakurai (Kyushu Univ.). Workshop on Solving Multivariate Polynomial Systems and Related Topics. Contents. Multivariate Signature Schemes Quadratic Forms

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computer and network security

computer and network security. matt barrie <mattb@ee.usyd.edu.au>. signatures. Used to bind an author to a document. Desirable properties of a signature: Authentic: sufficient belief that the signer deliberately signed the document.

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Efficient Ring Signatures Without Random Oracles

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Security Arguments for Digital Signatures and Blind Signatures

Security Arguments for Digital Signatures and Blind Signatures. Journal of Cryptology, (2000) 13: 361-396 Authors: D. Pointcheval and J. Stern Presented by J. Liu. Outline. Introduction Definitions The random oracle model Digital signature schemes Preliminaries

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Unconditionally S ecure First-Price Auction Protocols Using a Multicomponent Commitment Scheme

Unconditionally S ecure First-Price Auction Protocols Using a Multicomponent Commitment Scheme. Contents. Introduction and Preliminaries Multicomponent Commitment Scheme Secure First-Price Auction Protocols Verifiable Protocol with Non-Repudiation (VNR)

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Putting it all together: using multiple primitives together

Putting it all together: using multiple primitives together. Exercise 1. Say you have a signature scheme. SScheme = ( KGen , Sign, Vf ). Say this scheme is unforgeable against CMA. Modify the signature algorithm:. iff . & = 1. Is this still unforgeable against CMA?. Exercise 2.

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Two Stories of Ring Signatures

Two Stories of Ring Signatures. Yoshikazu Hanatani * Kazuo Ohta *. *The University of Electro-Communications. Ring Signature : Present. In 2001, a ring signature scheme was proposed by Rivest, Shamir, Tauman.

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A Quick Tour of Cryptographic Primitives

18739A: Foundations of Security and Privacy . A Quick Tour of Cryptographic Primitives. Anupam Datta CMU Fall 2009. Basic Cryptographic Concepts. Encryption scheme (symmetric and public key) Signature scheme Message authentication code Hash function

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Secure E-mail Protocols Providing Perfect Forward Secrecy

Secure E-mail Protocols Providing Perfect Forward Secrecy. Authors: Hung-Ming Sun, Bin-Tsan Hsieh and Hsin-Jia Hwang Src: IEEE Comm. Letter, Vol9, No1, pp 58-60, 2005 E-mail with Secure Communication. B (sender). S (Mail Server). A (Receiver). Sending Phase. ID A ,Encp PKA (k),E k [M].

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