How can Jailing and Backoff be used to demotivate online dictionary attack in an authentication system?
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1Need more information – StephenG Jul 22 '16 at 16:20
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I'm voting to close this question as off-topic because it is not a programming question as defined in the [help] guidelines. – Ken White Jul 22 '16 at 18:19
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Dictionary attacks means Trial-and-error from a list of potential passwords. Jailing and Backoff helps to slow down these attacks.
Jailing - Allow in, but restrict activities. It has interesting connections with access control. Backoff - The most common form is the exponential backoff.
Let x be a parameter selected by the administrator; the system waits x^0 = 1 second before re prompting the user, after n failures the system waits x^(n-1) seconds.

Luv Gautam
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