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Challenge-Response Authentication
CS 5323 Challenge-Response Authentication Prof. Ravi Sandhu Executive Director and Endowed Chair Lecture 9 © Ravi Sandhu World-Leading Research with Real-World Impact!
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Challenge-Response Authentication
NETWORK HOST WORK STATION User ID Challenge Response © Ravi Sandhu World-Leading Research with Real-World Impact! 2
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Vulnerable to man-in-the-middle
Challenge-Response Authentication NETWORK HOST WORK STATION User ID Challenge Vulnerable to man-in-the-middle attacks Response © Ravi Sandhu World-Leading Research with Real-World Impact! 3
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Time Synchronized NETWORK WORK HOST STATION User ID Challenge = Time
Response One Time Password © Ravi Sandhu World-Leading Research with Real-World Impact! 4
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Secret Key Based Secret Key Challenge Encrypt Response
© Ravi Sandhu World-Leading Research with Real-World Impact! 5
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Implicit challenge = Time
Time Synchronized Implicit challenge = Time Secret Key Time Encrypt Response One-Time Password © Ravi Sandhu World-Leading Research with Real-World Impact! 6
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Secret Key Based Secret Key Challenge MAC Response
© Ravi Sandhu World-Leading Research with Real-World Impact! 7
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Asymmetric Key Based Private Key Challenge Sign Response
© Ravi Sandhu World-Leading Research with Real-World Impact! 8
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Asymmetric Key Based Private Key Challenge Decrypt Response
© Ravi Sandhu World-Leading Research with Real-World Impact! 9
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