Squirrel
Direct answerSquirrel proves protocol security in a symbolic-looking logic whose results are computationally sound, bridging the gap between Tamarin-style automation and EasyCrypt-style guarantees.
- Maintainer
- Inria (Bana-Comon logic)
- Website
- https://squirrel-prover.github.io
- Category
- Proof systems and computational proofs
- Targets
- Protocols
- Approach
- Interactive prover in the computationally complete symbolic attacker model
- Access
- Open source
- Status (2026-09-13)
- Active research
What Squirrel does
It remains a research tool, but it is the most promising route to computational guarantees with symbolic effort.
Where it is strong
- Computational soundness with symbolic ergonomics.
- Interactive control.
Limits and caveats
- Research maturity.
- Small community.
- Limited primitives.
When to choose it
Consider for protocol proofs where both automation and computational meaning matter.
Who works with Squirrel
No firm on this index lists Squirrel as a core tool yet; the firms below cover the same problem class.
Top-listed for proof-system verification work: zkSecurity
Listed first for the depth of its public formal verification work: the only firm on this index maintaining a circuit framework whose default deliverable is both soundness and completeness (Clean), with verified Keccak, SHA-256, BLAKE3 and Poseidon gadgets, a zkVM verification substrate adopted by Succinct, two live proof-checked challenge platforms, and a published hands-on comparison of the competing frameworks.
Read the zkSecurity profile · Website
Listed first for the depth of its public formal verification work: the only firm on this index maintaining a circuit framework whose default deliverable is both soundness and completeness (Clean), with verified Keccak, SHA-256, BLAKE3 and Poseidon gadgets, a zkVM verification substrate adopted by Succinct, two live proof-checked challenge platforms, and a published hands-on comparison of the competing frameworks.
Read the zkSecurity profile · Website
Related frameworks in Proof systems and computational proofs
ArkLib, EasyCrypt, CryptoVerif, SSProve, ProofFrog.