Authentication protocols

Security in Computing (3rd Edition)

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1 October 14, 2005 © Doug Tygar, 2005 (cs161.org) CS 194-1 (CS 161) Authentication Doug Tygar (doug.tygar@gmail.com) October 14, 2005 cs161.org October 14, 2005 © Doug Tygar, 2005 (cs161.org) Authentication Alice and Bob love each other, but they live far apart We’ve learned how they can encrypt their messages How can they make sure they are talking to each other? This is the question of authentication October 14, 2005 © Doug Tygar, 2005 (cs161.org) Types of authentication End user End user Local computer (login) End user Remote computer (web site login) Computer Computer (DRM) Local computer End user (fake ATM check) Remote computer End user (phishing check) October 14, 2005 © Doug Tygar, 2005 (cs161.org) More types of authentication Things become even more complicated when we consider software authenticating This area is still under active development (we may talk about it at the end of class) “Trusted computing” October 14, 2005 © Doug Tygar, 2005 (cs161.org) Authentication is complicated It is surprisingly hard to authentication right I’ve taught semester length Ph.D. level courses on authentication and we still didn’t cover everything This lecture will talk about the basics October 14, 2005 © Doug Tygar, 2005 (cs161.org) Passwords Passwords are a classic way to authenticate (PIN numbers are a type of password) Advantages of passwords: ± Seemingly they work everywhere ± Easy to remember and use ± Everyone knows how to use them
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2 October 14, 2005
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Authentication protocols - CS 194-1 (CS 161) Authentication...

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