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Trustworthy software is hard and it's not getting any easier

This non-outrageous opinion explores the challenges of creating trustworthy software and why it is becoming increasingly difficult. It compares the trustworthiness of physical things, like bridges, to that of software. The text discusses the differences between hardware and software, and proposes the idea of making software more like hardware. It includes examples of how computing is becoming embedded in physical objects and suggests that the future of software lies in "shardware".

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Trustworthy software is hard and it's not getting any easier

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Presentation Transcript

  1. Outrageous Opinion

  2. Non-Outrageous Opinion #1 • Trustworthy software is hard   ...and its not getting any easier•Software is getting more complexfaster than software engineeringmethods are improving•Humans aren’t getting any smarter

  3. Non-Outrageous Opinion #2 • Most physical things are very trustworthy•Bridges rarely fall down•13 million commercial airlinetakeoffs/landings in 2002 with 0 fatalities!(CNN.com, 3 Jan)–Hmm…there was a lot of software involved too, maybe opinion #1 needs reconsideration!

  4. Hardware •Continuous–Adjacent states aresimilar•Inertia–Changes require force–Big changes requiremore force•Visible and Touchable–Easy to see tampering Software •Discrete–Adjacent states can becompletely different•Weightless–No force required–Changing a single bitcan break everything•Invisible and Odorless–Hard to smell tampering Why Software is Harder

  5. Can we make software morelike hardware? • •Yes!  Computing is becoming embedded inphysical stuff•Computing elements live in physical worlds –are beginning to interact with them directly•…but mostly indirect: sensors and actuatorsattached to computing devices, but programsdo not integrate computing and physicalenvironment

  6. Tip-of-Iceberg Examples • •Location-Limited Channels [Stajano &Anderson 99 (“Resurrecting Duckling”)],[Balfanz, et. al., NDSS 02]–Exploit physical properties of communicationmedium for authentication and confidentiality•Physical One-Way Functions [Gershenfeld &Pappu, 02]•Amorphous Computing [Abel, et. al., CACM00],Cell-Based Computing [George & Evans,WOSS 02]–Program global behaviors using local interactions

  7. Motto •    The Future of Software is“Shardware”(not “Shaftware”)

  8. Any questions? • David Evansevans@cs.virginia.eduhttp://www.cs.virginia.edu/evans

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