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Security in e-commerce Ahmad allahbakhshe
Introduction ,[object Object],[object Object],[object Object]
Mechanisms Cryptography types ,[object Object],[object Object],[object Object],[object Object]
Method Symmetric ,[object Object],[object Object],[object Object]
Hash Functions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Hash Functions f f f Y 0 Y 1 Y m-1 IV=CV 0 CV 1 CV m-1 n n n b b b … n n CV m =H(M)
MD5 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Strength of MD5 ,[object Object],[object Object],[object Object],[object Object]
Encryption algorithms ,[object Object],[object Object]
History of DES ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DES ,[object Object],[object Object],[object Object]
DES ,[object Object],[object Object],[object Object],[object Object],[object Object]
AES ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
AES ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
AES Encryption Decryption M E C KU a E KUa (M)= M e (mod n) D KR a D KRa (C)= C d (mod n) M n = pq d*e = 1 (mod ø(n)) Private key KRa = (d, n) Public key KUa = (e, n)
Public Key ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Types of attack ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Brute Force Attacks ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Firewalls ,[object Object],[object Object],[object Object],[object Object],[object Object]
Secure Protocols ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
SSL ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
SSL ,[object Object],[object Object],[object Object],[object Object]
SET ,[object Object],[object Object],[object Object],[object Object],[object Object]
SET
S/MIME ,[object Object],[object Object],[object Object],[object Object],[object Object]
S/MIME ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
S/MIME Versions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
TLS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
TLS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
SSH ,[object Object],[object Object],[object Object]
SSH ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Payment Gatway ,[object Object],[object Object],[object Object]
IPSec—IP Security ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Security Associations (SA) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
IPSec mode usage ,[object Object],[object Object],[object Object],[object Object]
IKE phases ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
IKE phases ,[object Object],[object Object]
IKE phase 1—main mode Alice Bob Crypto suites I support Crypto suite I choose g a mod p g b mod p g ab mod p{“Alice”, proof I am Alice} g ab mod p{“Bob”, proof I am Bob}
IKE phase 2 ,[object Object],[object Object],[object Object],[object Object]
[object Object]

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Moein

  • 1. Security in e-commerce Ahmad allahbakhshe
  • 2.
  • 3.
  • 4.
  • 5.
  • 6. Hash Functions f f f Y 0 Y 1 Y m-1 IV=CV 0 CV 1 CV m-1 n n n b b b … n n CV m =H(M)
  • 7.
  • 8.
  • 9.
  • 10.
  • 11.
  • 12.
  • 13.
  • 14.
  • 15. AES Encryption Decryption M E C KU a E KUa (M)= M e (mod n) D KR a D KRa (C)= C d (mod n) M n = pq d*e = 1 (mod ø(n)) Private key KRa = (d, n) Public key KUa = (e, n)
  • 16.
  • 17.
  • 18.
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  • 20.
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  • 23.
  • 24. SET
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  • 30.
  • 31.
  • 32.
  • 33.
  • 34.
  • 35.
  • 36.
  • 37.
  • 38. IKE phase 1—main mode Alice Bob Crypto suites I support Crypto suite I choose g a mod p g b mod p g ab mod p{“Alice”, proof I am Alice} g ab mod p{“Bob”, proof I am Bob}
  • 39.
  • 40.