SLIDE 1
Everything you need to know about Cryptography (unless youre a - - PowerPoint PPT Presentation
Everything you need to know about Cryptography (unless youre a - - PowerPoint PPT Presentation
Everything you need to know about Cryptography (unless youre a mathematician) Dont try this at home. Get an expert. Basic Cryptographic Tools Seriously though. Bad crypto ruins lives. Basic Cryptographic Tools Cryptographic Hash
SLIDE 2
SLIDE 3
Get an expert.
SLIDE 4
Basic Cryptographic Tools
SLIDE 5
Seriously though. Bad crypto ruins lives.
SLIDE 6
Basic Cryptographic Tools
SLIDE 7
Cryptographic Hash Functions
Digest Digest Blue arrow = Hash function
SLIDE 8
Symmetric Encryption
+ = + =
RNG
SLIDE 9
Public-key Cryptography
RNG Bob’s Private Key Bob’s Public Key
This arrow is math
SLIDE 10
Public-key Cryptography - Asymmetric Encryption
+ =
Bob’s Private Key
+ =
Data
Bob’s Public Key
Data
SLIDE 11
Public Key Cryptography - Signing
Bob’s Private Key
+
Data
=
Signed Dat By Bob
+
Bob’s Public Key
=
Signature Verification Signed Dat By Bob
SLIDE 12
Cryptosystems
SLIDE 13
Cryptographic tools are hard
SLIDE 14
But even the easy partsare dangerous
SLIDE 15
Cryptosystems
AKA ultra-high-stakes plumbing
SLIDE 16
PGP - Part 1
Alice’s Private
+ =
Signed Digest Symmetric
+ =
Bob’s Public
+
Symmetric
=
Encrypted For Bob Digest Digest Hash Sign Encrypt Encrypt
SLIDE 17
Bob’s Private
+ + =
PGP - Part 2
Signed Digest Alice’s Public
+ =
Signature and Integrity Verification Signed Digest Encrypted For Bob Encrypted For Bob Transmit Verify Decrypt