![]() Usability and overall ratings also favored the new system conditions over the control conditions. With the new system conditions, memorability was improved, and security was equivalent to or better than the control conditions. Fifty participants completed two sessions so that we could measure the usability and security of the authentication schemes. We conducted a study to evaluate our new system with a customized 1,450-word list and our new system with a 6-word sentence structure against the control conditions of a user-created passphrase of at least 24 characters and a system-generated passphrase using a 10,326-word list. Our assertion is that the added features of our system work particularly well with passphrases and help address these shortcomings. Passphrases exhibit a greater level of security than traditional passwords, but their wider adoption has been hindered by human factors issues. Our new system incorporates a user-generated mnemonic picture displayed during login, definition tooltips, error correction to reduce typographical errors, a decoy-based input masking technique, and random passphrase generation using either a specialized wordlist or a sentence template. We developed a new authentication system based on passphrases instead of passwords. As a consequence of this compensatory behaviour, there was a limit to the gain in password security achieved by PTP. We also found that those participants who had a high num- ber of random characters placed into their passwords would deliberately choose weaker pre-improvement passwords to compensate for the memory load. Our results show that the PTP varia- tions signicantly improved the security of users' passwords. In this paper, we present an 83-participant user study testing four PTP variations. Users may shue to be presented with randomly-chosen and positioned charac- ters until they nd a combination they feel is memorable. After users choose a password during creation, PTP improves its security by placing randomly-chosen characters at random positions into the password. We have developed Persuasive Text Pass- words (PTP), a text password creation system which lever- ages Persuasive Technology principles to inuence users in creating more secure passwords without sacricing usabil- ity. In- uencing users to create more secure passwords remains an open problem. ![]() Password restriction policies and advice on creating secure passwords have limited eects on password strength.
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