AI is finding vulnerabilities faster than humans can patch them.
Autonomous AI systems are now discovering zero-day vulnerabilities and writing working exploits at machine speed. Implementation-level bug hunting is being automated. The security that survives this shift is upstream: protocol architecture, cryptographic design, and threat modeling.
That is exactly what we do. Since 2017, Symbolic Software has delivered over 250 design-level security engagements for organizations that cannot afford to get cryptography wrong.
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What you get
A senior cryptography expert—not a junior analyst with a scanning tool—evaluating the decisions that determine whether your system is secure by design.
Our engagements cover
- Protocol architecture review. We evaluate your cryptographic protocol design: key exchange, authentication flows, session management, and state machines.
- Cryptographic design audit. Primitive selection, parameter choices, composition of schemes, and whether your threat model matches reality.
- Implementation verification. Detailed code review across Go, Rust, TypeScript, Swift, Java, .NET, and more—verifying that the design was correctly realized.
- Post-quantum readiness. Migration assessment for systems that need to survive the next decade of cryptanalytic advances.
- Formal verification. Machine-checked proofs of protocol correctness using tools we built and maintain ourselves.
Trusted by organizations that ship cryptography to hundreds of millions of users
What they say about working with us
We have been working together with Symbolic Software as auditors for cryptographic software. They are reliable, precise, honest, thorough and think outside the box.
Mario Heiderich, Director, Cure53.
Symbolic Software is run by an accomplished researcher, with significant contributions in the area of applied cryptography. They're the right team for projects that require rigorous design and engineering.
Jean-Philippe Aumasson, Chief Security Officer, Taurus Group.
Symbolic Software are a delight to work with. Their reports are incredibly thorough and they maintain an excellent line of communication. We are grateful we got the opportunity to collaborate with someone of such high calibre.
Vishnu Mohandas, Founder, Ente.io.
Why Symbolic Software
We are not a generalist penetration testing firm. We are an applied cryptography practice, founded and led by Dr. Nadim Kobeissi—certified as a national expert in cryptography by the French Ministry of Research and Innovation.
- 250+ completed engagements spanning password managers, encrypted messaging, digital wallets, VPNs, authentication frameworks, and smart contracts.
- Clients include 1Password, Mozilla Thunderbird, Coinbase, Zoom, Bitwarden, Dashlane, NordVPN, ExpressVPN, MetaMask, and the Linux Foundation.
- Open source tooling. Verifpal (formal verification), Crucible (post-quantum conformance testing), and Noise Explorer (protocol analysis).
- Published research. Peer-reviewed work on cryptographic protocol analysis and formal verification.
Ready to start?
Most engagements begin within two weeks of first contact. We scope the work together, agree on timeline and deliverables, and get started.
We typically respond within one business day.