Basic HTML version of Foils prepared May 30 99

Foil 20 Combining Public and Secret Keys

From Basic Mathematics of Security Systems CPS714 Computational Science Information Track -- June 2 99. by Geoffrey C. Fox
So one can take advantage of both security approaches by using Public Key Infrastructure to initialize a session
  • One participant chooses a random secret key
  • This is encrypted using public key of recipient
  • recipient decodes this digital envelope with his or her private key
Thereby they have set up joint knowledge of a secret key without usual disadvantages
  • secret key is used for rest of session
Note secret key is only used for this session and so one must break in real time

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