Charles Guillemet
Ledger
1 episode on Chain of Thought
Charles Guillemet is CTO of Ledger and founder of the Donjon, Ledger’s internal offensive security lab that breaks the company’s own products before attackers can, after a decade in cryptography and secure hardware design. On Chain of Thought he argued that software alone cannot secure an AI agent moving real money, and made the case for hardware-enforced signatures in the agentic economy.
Episodes
In their words
per day because there is not less than $5 maybe you can put the private key that secure your $5 inside the agent because you don't really care if it's stolen. It's also a trade-off between what you want to secure and how much you spend into the design of the security of your agent.
You Can't Secure an AI Agent with Software