Proactive Password Checking with Decision Trees
Authors: Francesco Bergadano, Bruno Crispo, Giancarlo Ruffo

Date: April 1997
Publication: Proceedings of the 4th ACM Conference on Computer and Communications Security, CCS '97
Page(s): 67 - 77
Publisher: ACM
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Abstract or Summary:
The important problem of user password selection is addressed and a new proactive password checking technique is presented. In a training phase, a decision tree is generated based on a given dictionary of weak passwords. Then, the decision tree is used to determine whether a user password should be accepted. Experimental results described here show that the method leads to very high dictionary compression (from 100 to 3 in the average) with low error rates (of the order of 1%). We survey previous approaches to proactive password checking, and provide an in-depth comparison. Note: A newer version of this paper was published with the title High Dictionary Compression for Proactive Password Checking

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