Gilles Brassard is a computer scientist whose work with Charles H. Bennett established an influential approach to quantum key distribution. Their 1984 protocol, now called BB84, encodes information in pure states represented by nonorthogonal vectors and uses classical communication to compare the preparation and measurement choices.[ref]
The physical idea is that an observer who does not know the preparation basis cannot extract the encoded information without risking detectable disturbance. The protocol therefore uses sampled outcomes to assess the shared data. Its classical discussion must be authenticated: otherwise an active intermediary could impersonate each participant. This connects the physics of quantum measurement with assumptions about the surrounding cryptographic protocol.[ref]
Quantum cryptography: Public key distribution and coin tossing by Charles H. Bennett and Gilles Brassard. Introduction, passive versus active eavesdropping; protocol discussion
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Portrait of Gilles Brassard
. Lëa-Kim Châteauneuf. CC BY-SA 4.0, via Wikimedia Commons. Source. Articles by others on the same topic
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Gilles Brassard is a prominent Canadian computer scientist known for his significant contributions to the fields of quantum computing and quantum cryptography. He is particularly recognized for his work in developing protocols for quantum key distribution, most notably the BB84 protocol, which he co-created with Charles Bennett in 1984. This protocol is one of the first and most widely studied methods for secure communication using quantum mechanics principles.