Everything you need to know about Cryptography (unless youre a - PowerPoint PPT Presentation

Everything you need to know about Cryptography (unless you’re a mathematician)

Don’t try this at home.

Get an expert.

Basic Cryptographic Tools

Seriously though. Bad crypto ruins lives.

Basic Cryptographic Tools

Cryptographic Hash Functions Blue arrow = Hash function Digest Digest

Symmetric Encryption RNG + = + =

Public-key Cryptography Bob’s Private Key This arrow is math RNG Bob’s Public Key

Public-key Cryptography - Asymmetric Encryption Bob’s Public Key + = Data Bob’s Private Key + = Data

Public Key Cryptography - Signing Bob’s Private Key Signed Dat + = Data By Bob Bob’s Public Key Signed Dat Signature + = By Bob Verification

Cryptosystems

Cryptographic tools are hard

But even the easy partsare dangerous

Cryptosystems AKA ultra-high-stakes plumbing

PGP - Part 1 Hash Digest Alice’s Signed + = Sign Digest Private Digest Symmetric Encrypt + = Bob’s Symmetric Encrypted + = Encrypt Public For Bob

PGP - Part 2 Signed Encrypted Transmit Digest For Bob Bob’s Encrypted + + = Decrypt Private For Bob Signature and Signed Alice’s = + Verify Integrity Digest Public Verification