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Public Key Cryptography. More accurately…. Some Security Issues. Can anyone see the messages? Is it really Alice who is sending the message? Has the message been tampered with?. Privacy Authenticity Integrity. How cryptography helps. Encryption Schemes Digital Signatures

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Presentation Transcript
some security issues
Some Security Issues
  • Can anyone see the messages?
  • Is it really Alice who is sending the message?
  • Has the message been tampered with?
  • Privacy
  • Authenticity
  • Integrity
how cryptography helps
How cryptography helps
  • Encryption Schemes
  • Digital Signatures
  • Message Authentication Codes
  • Privacy
  • Authenticity
  • Integrity
encryption
Encryption

This can be done in two ways:

  • Alice and Bob agree on a secret key and use the secret key to encrypt/decrypt messages
  • Alice encrypts her message using Bob’s public key, send it to Bob. Bob uses his private key to decrypt the message and vice versa.
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