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CSE 5/7353 – February 1 st 2006

CSE 5/7353 – February 1 st 2006. Public Key Cryptography. Keys. Public Key Private Key. Uses. Y = E (Pub , X) X = D(PRb, Y). Uses. Y = E (PRa , X) X = D(PUa, Y). Uses. Z = E (PRb, E((PRa , X)) X = D(PUa, D(PRa, Y). Algorithms. RSA Elliptic Curve Diffie-Hellman DSS.

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CSE 5/7353 – February 1 st 2006

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  1. CSE 5/7353 – February 1st 2006 Public Key Cryptography

  2. Keys • Public Key • Private Key

  3. Uses • Y = E (Pub , X) • X = D(PRb, Y)

  4. Uses • Y = E (PRa , X) • X = D(PUa, Y)

  5. Uses • Z = E (PRb, E((PRa , X)) • X = D(PUa, D(PRa, Y)

  6. Algorithms • RSA • Elliptic Curve • Diffie-Hellman • DSS

  7. Diffie-Hellman

  8. Diffie-Hellman Example

  9. Hashes • Calculate hash code • Encrypt Hash Code for Authentication. • Message Example

  10. Birthday Attack

  11. Birthday Attack Math

  12. Block Chaining

  13. Meet in the Middle

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