Introducing the Check-Off Password System (COPS): An Advancement in User Authentication Methods and Information Security
Making Passwords Secure and Usable
Password Security - A Case History
Perceived Usefulness, Perceived Ease of Use, and User Acceptance of Information Technology
The magical number seven plus or minus two: some limits on our capacity for processing information.
Why Johnny Can't Encrypt: A Usability Evaluation of PGP 5.0