Cryptography
Cryptography
Secret Key Cryptography
Public Key Cryptography (a.k.a. asymmetric cryptography)
PP Presentation
Digital Signature
Transmitting over an insecure channel.
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OK Alice, Your place or mine?
Bob’s Dilemma
Alice can sign her message!
Message Digest
Alice’s Signature
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Why the digest?
Implications
Another possible problem
Solution?
Speed
Secure Protocols
Secure Protocols
Security