Question-and-answer passwords: an empirical evaluation
Information Systems
Pass-sentence—a new approach to computer code
Computers and Security
Protecting secret keys with personal entropy
Future Generation Computer Systems - Special issue on security on the Web
Error-tolerant password recovery
CCS '01 Proceedings of the 8th ACM conference on Computer and Communications Security
Personal knowledge questions for fallback authentication: security questions in the era of Facebook
Proceedings of the 4th symposium on Usable privacy and security
Quantifying the security of preference-based authentication
Proceedings of the 4th ACM workshop on Digital identity management
Personal choice and challenge questions: a security and usability assessment
Proceedings of the 5th Symposium on Usable Privacy and Security
Let Only the Right One IN: Privacy Management Scheme for Social Network
ICISS '09 Proceedings of the 5th International Conference on Information Systems Security
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The author describes a framework for designing user authentication systems with challenge questions that includes privacy, security, and usability criteria for evaluating a candidate challenge-question system. The proposed challenge-question system for recovering user credentials is based on this framework.