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Who ‒ The Tahoe-LAFS Project

• Brian Warner, Zooko Wilcox-O'Hearn, David-Sarah Hopwood, and many more
• https://tahoe-lafs.org
• https://LeastAuthority.com

About this talk

• Tahoe-LAFS crypto design
• things you might be able to do with this information:
• definitions (e.g. Ristenpart et al. 2013)
• proofs
• variants with better security and performance
• extensions with new features from our wishlist
• implement it!

What ‒ cryptographic storage

Why ‒ use cases

• backup …with “provider-independent security”
• file-sharing
• censorship-resistant hosting?
• decentralized web apps‽ …e.g. “TiddlyWiki”

How ‒ part 1: capabilities

• start with a cap
• location/routing
• integrity/file identity
• access control

How ‒ part 2: mutable and immutable files

How ‒ part 2: mutable and immutable files

How ‒ part 2: mutable and immutable files

How ‒ part 2: mutable and immutable files

How ‒ part 2: mutable and immutable files

How ‒ part 3: erasure coding

How ‒ part 3: erasure coding

How ‒ putting it all together

How ‒ putting it all together