Charles Guillemet
Charles Guillemet is the Chief Technology Officer at Ledger, the global leader in digital asset security. He established the company’s renowned security department and its dedicated evaluation lab, The Ledger Donjon. Under his technical leadership, Ledger has become a world-class Web3 security provider, protecting over 20% of all cryptocurrencies and 30% of NFTs worldwide. A recognized authority in cryptocurrency and blockchain security, Guillemet joined Ledger in 2017 after a decade in cryptography and hardware security. He previously served as Technical Manager at the Information Technology Security Evaluation Facility within CEA, France’s leading research organization, and lectured on Hardware Security with a focus on smart card technology at the engineering school ENSIMAG.
Charles Guillemet Professional Experience / Academic History
Professional Experience
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Chief Technology Officer
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Lecturer on Hardware Security
Academic History
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M.S., Cryptography and Security
Charles joined Ledger as Chief Security Officer and was later promoted to Chief Technology Officer in 2019.
As CTO, he is responsible for overseeing software engineering, security research, product security, infrastructure, architecture and innovation at Ledger.
In 2024, under his tech leadership, Ledger expanded its offerings with two innovative devices featuring secure touchscreens: the Ledger Flex and the Ledger Stax.
He has also overseen security assessments for Ledger’s products, procured independent security certifications for both the Ledger Nano S and Ledger Nano X, and has built industry leading open source hardware and software security tools.
EARLY CAREER
Before joining Ledger, Charles spent 10 years in the cryptography & hardware security sector, starting with Tiempo, an innovative secure start-up where he designed EAL5+ secure integrated circuits.
He then worked as Technical Manager in an Information Technology Security Evaluation Facility (ITSEF) at the CEA, the French research organization.
His field of expertise includes cryptography, blockchain, software and software engineering.
His interests include decentralized protocols for Crypto: L1 Bitcoin, Ethereum, DeFi, DAO, NFT and more recently L2.
MEDIA & SPEAKING
Charles has been a speaker at several security, crypto, blockchain, and Web3 conferences.
He has been featured or interviewed at The Block, Blockworks, Cointelegraph, CoinDesk, Yahoo! Finance, and more.
He has appeared as a guest in the 2023 Real Vision Festival of Learning.