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Online Trust and Digital Certificates: Tech Tutorial Edward W. - - PowerPoint PPT Presentation
Online Trust and Digital Certificates: Tech Tutorial Edward W. - - PowerPoint PPT Presentation
Online Trust and Digital Certificates: Tech Tutorial Edward W. Felten Professor of Computer Science and Public Affairs Princeton University Secure connection means: 1.Protected channel to some server 2. Authentication of the servers
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Secure connection means: 1.Protected channel to some server 2.Authentication of the server’s identity
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∀ 0 < x < pq: x(p-1)(q-1) mod pq = 1
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- nline identity: distinctive but anonymous
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- nline identity: distinctive but anonymous
like a fingerprint
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digital signature stamp document with your fingerprint
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digital signature stamp document with your fingerprint
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https://www.princeton.edu
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Whose fingerprint is that? https://www.princeton.edu
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princeton.edu’s fingerprint: Signed,
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princeton.edu’s fingerprint: Signed,
certificate (“cert”)
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https://www.princeton.edu princeton.edu’s fingerprint: Signed,
+
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Certificate Authority (“CA”)
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Certificate Authority (“CA”) issues / signs certificates
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Certificate Authority (“CA”) issues / signs certificates based on due diligence
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Is that really the CA’s fingerprint?
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Is that really the CA’s fingerprint? Do I trust the CA?
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Treat this fingerprint as if it were my own Signed,
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“domain validation” cert “extended validation” cert
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“domain validation” cert “extended validation” cert green
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