Languages at Galois Joey Dodds and many others Trust boundary - PowerPoint PPT Presentation

Aug 02, 2023 •426 likes •601 views

Languages at Galois Joey Dodds and many others Trust boundary Aggregator Aggregator User Core Aggregator Aggregator User What does a user want? Sandwich eating certificate System What does a user want? Sandwich eating certificate

Languages at Galois Joey Dodds and many others
Trust boundary Aggregator Aggregator User Core Aggregator Aggregator User
What does a user want? Sandwich eating certificate System
What does a user want? Sandwich eating certificate checker at time t System
How many languages? 5 * *It’s way more than 5
Trust boundary Aggregator Aggregator User Core Aggregator Aggregator User
Layered verification ● Code meets a low-level specification ● Low-level specification meets higher-level specification ● High level-specification has meaningful properties
Trust boundary Aggregator Aggregator User Core Aggregator Aggregator User
Layered verification (TLS) ● Code meets a low-level specification Proof that C code for transition function is equal to ours ● Low-level specification meets higher-level specification Proof that our transition fn is equal to a fn written from RFCs ● High level-specification has meaningful properties Handshake always completes
Trust boundary Aggregator Aggregator User Core Aggregator Aggregator User
Proof for internal messages In we’ve defined executable serialization and parsing functions We have proved: ∀ msg . parse (serialize msg ) = msg
Proof for monolithic system In we’ve defined a linear temporal logic This allows us to talk about things that ☐ always happen And ♢ eventually happen
Proof for monolithic system We prove that if a user sends a message to the system now, eventually they will get a certificate back This was crazy hard

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