Justin Brickell

1
Secure Remote Diagnostics

• Justin Brickell
• Donald E. Porter
• Vitaly Shmatikov
• Emmett Witchel
• The University of Texas at Austin

2
Error messages are cryptic
What is this and how do I fix it?
3
Troubleshooting is no longer local
I can diagnose this fault online
4
Software diagnostic scenario
? Program faults
? Evaluation
v
T(v)
T
Diagnostic program
? Local state v
? Diagnosis T(v)
Detailed problem description and solution guide
5
Our goal Protect user privacy

• Program memory
• File snippets
• Other running programs
• Confidential information

If you are concerned that a report might contain
personal or confidential information, you should
not send the report.
Local state v
Problem Users with privacy concerns cannot
participate
6
Talk outline

• Two unsatisfactory approaches
• Overview of our approach
• Building blocks
• Protocol walkthrough
• Applications
• Performance
• Conclusion

7
User-side evaluation
? Program faults

• Proprietary ()
• Reveals vulnerabilities
• Helps reverse engineer

? Evaluation
T
? Diagnostic
v
T(v)
T
Problem Vendor also has privacy concerns
8
Secure multiparty computation
? Program faults
Circuit to apply T to v
? Evaluation
Description of T
v
T
?