set315 - Digital Signatures Dr Cunsheng Ding Department of...

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Unformatted text preview: Digital Signatures Dr. Cunsheng Ding Department of Computer Science HKUST, Hong Kong China Lectures 15 Main Topics  % igital signature  Proxy digital signature (special type)  Blind digital signature (special type) Basic Requirements • The signature must depend on the message being signed. • The signature must use some information unique to the sender, to prevent both forgery and denial. • It must be relatively easy to produce the digital signature. • It must be relatively easy to recognize and verify the digital signature. • It must be computationally infeasible to forge a digital signature. • It must be practical to retain a copy of the digital signature in storage.  C. Ding - COMP4631 - L15  ¡ Two Approaches • RSA plus a hash function. • The Digital Signature Standard (DSS) – It will not be introduced in this course.  C. Ding - COMP4631 - L15  ¡ Proxy Digital Signature Special type of digital signature What is a Proxy Digital Signature • A special kind of digital signature. • Allows a principal to delegate his power of signing messages to his proxy.  C. Ding - COMP4631 - L15  ¡  C. Ding - COMP4631 - L15  ¡ Proxy Digital Signature  Scenario – Bob, for instance, may be on a business trip...
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set315 - Digital Signatures Dr Cunsheng Ding Department of...

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