CST 312 Pablo Breuer.  First published public-key algorithm  A number of commercial products employ this key exchange technique  Purpose is to enable.

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Presentation transcript:

CST 312 Pablo Breuer

 First published public-key algorithm  A number of commercial products employ this key exchange technique  Purpose is to enable two users to securely exchange a key that can then be used for subsequent symmetric encryption of messages  The algorithm itself is limited to the exchange of secret values  Its effectiveness depends on the difficulty of computing discrete logarithms

 Users could create random private/public Diffie-Hellman keys each time they communicate  Users could create a known private/public Diffie-Hellman key and publish in a directory, then consulted and used to securely communicate with them  Vulnerable to Man-in-the-Middle-Attack  Authentication of the keys is needed