The Basics of Cryptography

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CRYPTOGRAPHY THE BASICS by JAMES HALL

description

A talk I did on Cryptography at Hey!Stac http://hey.wearestac.com/

Transcript of The Basics of Cryptography

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CRYPTOGRAPHYTHE BASICS

by JAMES HALL

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DIRECTOR/FOUNDER AT

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jsPDF JAVASCRIPT PDF GENERATION LIBRARY

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WHAT ISCRYPTOGRAPHY?

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DEMO

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A CIPHERIS A DIGITAL

LOCK

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CAESAR CIPHERUSED IN WARSAROUND 50BC

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ABCDEFGHIJKLM

XYZABCDEFGHIJ

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ABCDEFGHIJKLM

XYZABCDEFGHIJ

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Shift Cipher

I LOVE FREE BROWNIES

I LOVE FREE BROWNIES

Input

Output

0Shift Value (Key)

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Shift Cipher

I LOVE FREE BROWNIES

J MPWF GSFF CSPXOJFT

Input

Output

1Shift Value (Key)

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Shift Cipher

I LOVE FREE BROWNIES

K NQXG HTGG DTQYPKGU

Input

Output

Shift Value (Key)

2

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One-Time Pad

ILOVEFREEBROWNIES

KLREJNUNGBSXZVNNU

Input

Output

Key

20395839201938592

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STREAM CIPHER

ILOVEFREEBROWNIESInput

Output

78943Key (Shared secret)

Key stream (PRNG)

06947294068240593

IQXZLHAIEHZQANNNV

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HOW TO GET ASHAREDSECRET

(WITH THIS ONE WEIRD TRICK)

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TOM HARRY

EVE

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TOM HARRY

EVE

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TOM HARRY

EVE

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TOM HARRY

EVE

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TOM HARRY

EVE

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TOM HARRY

EVE

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TOM HARRY

EVE

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A LOCK ICONDOESN’T MEANYOU’RE SECURE

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FORGED GOOGLE.COM CERTS

USED TO SPYon 300,000 Iranian users

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SSLIS BROKEN

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Stanford JavaScriptCrypto Library

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ANY QUESTIONS?


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