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Secure Electronic Transaction

Secure Electronic Transaction. Creating Debts Online with Confidence. SET Objectives. To encrypt critical information over the internet To separate the merchant from credit card information To link payment and order information. SET. Starring. Alice as the Cardholder

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Secure Electronic Transaction

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  1. Secure Electronic Transaction Creating Debts Online with Confidence

  2. SET Objectives • To encrypt critical information over the internet • To separate the merchant from credit card information • To link payment and order information

  3. SET Starring • Alice as the Cardholder • Bob’s Beer Delivery as the Merchant • Visa as the Issuer • Wachovia as the Acquirer/Payment Gateway

  4. Dual Signature How Bob can prove Alice paid for Natural Light and not Samuel Adams

  5. PIMD PI H E kra DS POMD H || OI H OIMD Dual Signature Creation

  6. ! = How Bob Uses the DS DS = Ekra[ H( H(PI) || H(OI) ) ] • DS • PIMD • OI Ekua [ Ekra[ H( H(PI) || H(OI) ) ] ] H( H(PI) || H(OI) ) H( PIMD || H(OI) )

  7. ! = How Wachovia Uses the DS DS = Ekra[ H( H(PI) || H(OI) ) ] • DS • PI • OIMD Ekua [ Ekra[ H( H(PI) || H(OI) ) ] ] H( H(PI) || H(OI) ) H( H(PI) || OIMD )

  8. Payment Processing • Purchase Request • Alice to Bob’s Beer Delivery • Payment Authorization • Bob’s Beer Delivery to Wachovia • Wachovia to Visa

  9. Sent on by Bob’s Beer Delivery to Wachovia (Money Related) Contains Key To Decrypt Dual Sig (KPUB-Alice ) Used by Bob’s Beer Delivery (Order Related) From Alice To Bob’s Beer PIMD + Order Info + Dual Sig + Alice’s Cert. + + Dig Envelope

  10. Payment Processing • Purchase Request • Alice to Bob’s Beer Delivery • Payment Authorization • Bob’s Beer Delivery to Wachovia • Wachovia to Visa

  11. Sent on by Bob’s Beer Delivery to Wachovia (Money Related) Contains Key To Decrypt Dual Sig (KPUB-Alice ) Used by Bob’s Beer Delivery (Order Related) From Alice To Bob’s Beer PIMD + Order Info + Dual Sig + Alice’s Cert. + + Dig Envelope

  12. From Alice Through Bob To Wachovia Money Info Encrypted Using Symmetric Key + Symmetric Key Encrypted Using Wachovia’s Public Key Dig Envelope

  13. KS Bob’s Beer To Wachovia Payment Info E Dual Sig OIMD Temporary Symmetric Key Generated by Alice

  14. KS KPUB-Wachovia Digital Envelope E Dig Envelope

  15. D Payment Info KPRI-Wachovia Dual Sig OIMD KS KS D Obtaining The Payment Info Dig Envelope

  16. SET Interoperability • Software development on SET protocol • Brokat, Entrust, Globeset, GTE, IBM, TrinTech, Verisign • SET costs • Software development • Hardware and runtime increases with high volume of transactions

  17. Conclusion • Non-repudiation • Inherited credit card risks • Not widely used

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