Next Steps toward More Trustworthy Interfaces Burt Kaliski, RSA Laboratories 1 st Workshop on Trustworthy Interfaces for Passwords and Personal Information June 13, 2005

Market Problem Users don’t have a convenient way of gaining confidence that the applications they’re interacting with are the correct ones —especially when entering passwords and personal information User interface is typically not trustworthy, so can’t tell if application can be trusted —“WYSINWYG” – what you see isn’t necessarily what you get An important and relatively separable part of the broader trustworthy computing issue

Not Just Passwords … More trustworthy interfaces benefit other authentication types besides traditional passwords, e.g.: —PIN entry for smart cards and other security tokens —one-time passwords (challenge-response, event-sync, time-sync) —passwords to unlock software credentials Trustworthy interfaces can be a platform for transitioning to stronger authentication, starting with passwords

Multiple Stakeholders Market problem brings together multiple parties involved in the interfaces and supporting protocols: —Application developers —Browser, OS and desktop software vendors —Identity providers and certificate authorities —User experience designers —Research community None can address the full problem alone – stakeholders must work together

Some Related Work All of this workshop, of course … Kim Cameron’s “Laws of Identity,” at the system level Carl Ellison and Jesse Walker’s “Ceremonies” —protocol interaction involving humans 1.User control and consent 2.Minimal disclosure for a constrained use 3.Justifiable parties 4.Directed identity 5.Pluralism of operators and technologies 6.Human integration 7.Consistent experience across contexts

Proposed Criteria for a Trustworthy Interface for Passwords and Personal Information 1. User can tell when interacting with an application through a trustworthy interface (e.g., via reserved “real estate”) 2. Interface provides a “trusted path” for data entry, protecting against other software 3. User can activate interface, or it can be activated automatically 4. User can verify identity of application through interface 5. Authentication is mutual – application must also demonstrate knowledge of password (or other authentication credential) 6. Personal information is protected – trusted interface won’t provide to incorrect application

Presumptions 1. Market problem is important 2. Collaboration of multiple stakeholders is essential to solve it Industry goal: Provide trustworthy interfaces that give users confidence that their online interactions are with parties they trust, especially when entering passwords and personal information

Potential Collaborations: Putting TIPPI into Practice 1. Publish workshop summaries and propose concepts in other forums 2. Prepare an open letter challenging the industry to improve interfaces 3. Promote industry standards efforts: user interface criteria and specific user experience designs supporting protocols and APIs 4. Provide reference implementations browser plug-ins, OS extensions 5. Plan on 2 nd TIPPI Workshop, June 2006!

For More Information Burt Kaliski Chief Scientist, RSA Laboratories VP Research, RSA Security Magnus Nyström Technical Director, Office of the CTO RSA Security (Stockholm Office)