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Digital signature and multiple signature: Different cases for different purposes

Like paper-based signatures, digital signatures intend to respect a number of security assumptions. Methods of digital signature apposed by a single user have been defined and are widely used. But is it sufficient? What if a legal document requires witnesses and notarization, or a contract needs the signatures of several officers?This paper will first show the basics to understand digital signatures and how the a security properties of integrity, authentication, and non-repudiation are respected. We will then present the purposes of multiple signature schemes and introduce a possible classification of cases that need multiple signatures. I | Reading Room wis Interested in learning more about security SANS Institute InfoSec Reading Room This paper is from the SANS Institute Reading Room site. Reposting is not permitted without express written permission. Digital Signature and Multiple Signature Different Cases for Different Purposes Like paper-based signatures digital signatures intend to respect a number of security assumptions. Methods of digital signature apposed by a single user have been defined and are widely used. But is it sufficient What if a legal document requires witnesses and notarization or a contract needs the signatures of several officers This paper will first show the basics to understand digital signatures and how the security properties of integrity authentication and non-repudiation are respected. We will then present th. Copyright SANS Institute Author Retains Full Rights Digital Signature and Multiple Signature Different Cases for Different Purposes IA H9M IDI 06E4 Chafic Maroun Rouhana Moussa GSEC Practical Assignment Version 1.4b Option 1 - Research on Topics in Information Security July 7th 2003 Abstract Like paper-based signatures digital signatures intend to respect a number of security assumptions. Methods of digital signature apposed by a single user have been defined and are widely used. But is it sufficient What if a legal document requires witnesses and notarization or a contract needs the signatures of several officers This paper will first show the basics to understand digital signatures and how the security properties of integrity authentication and non-repudiation are respected. We will then present the purposes of multiple signature schemes and introduce a possible classification of cases that need multiple signatures. This paper is not intended as a presentation of a particular multiple signature scheme but the classification presented should help researchers identify more appropriate new multiple signature schemes. SANS Institute 2003 As part of the Information .