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Cisco Securit y

Cisco Securit y. An Example. => How to transport the letter safely ? => Worry somebody intercept the letter ? => Worry somebody falsify the letter ? => Worry writter or transporter negative the letter ?. Security Meaning. => Ensure the source

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Cisco Securit y

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  1. Cisco Security

  2. An Example • => How to transport the letter safely ? • => Worry somebody intercept the letter ? • => Worry somebody falsify the letter ? • => Worry writter or transporter negative the letter ?

  3. Security Meaning • => Ensure the source • => Ensure the message could not be falsify or intercept • while transportion • => Ensure the message could not be cracked • => No negation

  4. Basics of Encryption • There are two types of encryption keys: • => Symmetric • => Asymmetric

  5. Symmetric With symmetric key encryption, each peeruses thesame key to encryptand decrypt the data.

  6. SymmetricEncryption

  7. Maybe Perfect

  8. An Obvious Problerm • => How to send the "key" ? • => QQ ? MSN ? E-mail ? Telephone ? • => Bike ? Bus ? Train ? Airplane ?

  9. Asymmetric • With asymmetric key encryption, the local end uses one • key to encrypt,and the remote end uses another key to • decrypt the traffic.

  10. Asymmetric Encryption

  11. Maybe Perfect

  12. An Obvious Problem • => Cracker will exchange the letter . How to solve this • problerm ?

  13. A perfect Encryption

  14. A Perfect Decryption

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