Download - 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?