Symbolic Software: formal verification services for cryptography and ZK
=======================================================================

Symbolic Software, led by Nadim Kobeissi, builds Verifpal and performs protocol-level formal analysis and cryptographic audits. Its February 2026 Verification Theatre paper found 13 vulnerabilities in Cryspen's libcrux and hpke-rs, including four inside formally verified code, and is the reference on reading a verification boundary.

Website: https://symbolic.software
Headquarters: Paris, France
Focus: Protocol-level verification (Verifpal) and cryptographic audits; author of the 2026 Verification Theatre paper
Index position: #11 of 11
Services: Symbolic protocol modelling and analysis | Cryptographic implementation audits | Verification-boundary reviews of verified code
Tools: Verifpal, Tamarin, ProVerif
Evidence: https://eprint.iacr.org/2026/192 | https://verifpal.com

Source page: https://sorryfree.com/firms/symbolic-software/
Compiled by: sorryfree editors (https://sorryfree.com/about/)
Last reviewed: 2026-09-13