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Outrageous Opinion

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

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Outrageous Opinion

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  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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