Gilles Brassard is a prominent Canadian computer scientist recognized for his foundational contributions to quantum cryptography and quantum computing. He co-invented the BB84 protocol, the first and most famous quantum key distribution scheme, which allows two parties to securely share encryption keys using the principles of quantum mechanics. His work is essential in establishing the theoretical underpinnings of how quantum mechanics can be applied to secure communication, making it a cornerstone of modern cryptographic practices.
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