Security. Cryptography (1) Intruders and eavesdroppers in communication.

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Presentation transcript:

Security

Cryptography (1) Intruders and eavesdroppers in communication.

Cryptosystems Symmetric key cryptosystems –Same key is used for encryption and decryption –DES Asymmetric key cryptosystems –Public key and private key –Usage depends on application –RSA Hash functions –Detecting message tampering –MD5

Authentication Authentication based on a shared secret key.

Efficient Authentication? Authentication based on a shared secret key, but using three instead of five messages.

Authentication Using Public-Key Cryptography Mutual authentication in a public-key cryptosystem.

Authentication Using a Key Distribution Center (1) Figure The principle of using a KDC.

Authentication Using a Key Distribution Center (2) Figure Using a ticket and letting Alice set up a connection to Bob.