Public key cryptography
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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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Public Key Cryptography

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Public key cryptography

Public Key Cryptography


More accurately

More accurately…


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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