Crypt

Cryptography Reference: Network Security PRIVATE Communication in a PUBLIC World. by Kaufman, Perlman & Speciner.

Secret Key Cryptography ,[object Object],[object Object],[object Object]

Public Key Cryptography (a.k.a. asymmetric cryptography) ,[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Using Keys

Digital Signature ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Transmitting over an insecure channel. ,[object Object],[object Object],[object Object],[object Object],[object Object]

Hello Bob, Wanna get together? Alice Bob encrypt using B public decrypt using B private

OK Alice, Your place or mine? Alice Bob decrypt using A private encrypt using A public

Bob’s Dilemma ,[object Object],[object Object],[object Object]

Alice can sign her message! ,[object Object],[object Object]

Message Digest ,[object Object],[object Object],[object Object],[object Object]

Alice’s Signature ,[object Object],[object Object],[object Object],[object Object]

Alice Bob Sign with A private check signature using A public encrypt using B public decrypt using B private Revised Scheme

Why the digest? ,[object Object],[object Object]

Implications ,[object Object],[object Object]

Another possible problem ,[object Object],[object Object],[object Object],[object Object],[object Object]

Solution? ,[object Object],[object Object],[object Object],[object Object]

Speed ,[object Object],[object Object],[object Object],[object Object]

Secure Protocols ,[object Object],[object Object],[object Object],[object Object],[object Object]

Secure Protocols ,[object Object],[object Object],[object Object]

SSL and TLS ,[object Object],[object Object]

SSL layer Application SSL TCP IP Application SSL TCP IP

Advantages of SSL/TLS ,[object Object],[object Object],[object Object],[object Object]

HTTPS Usage ,[object Object],[object Object],[object Object],[object Object],[object Object]

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