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The New Math of Quantum Cryptography
In theory, quantum physics can bypass the hard mathematical problems at the root of modern encryption. A new proof shows how.
The tower itself is the second part—there you can find specific cryptographic protocols that let you send private messages, sign digital documents, cast secret ballots, and more. The crucial step was defining another mathematical building block that served as something like a basement floor: a structure that would connect the foundation of one-way state generators to a tower of cryptographic protocols. When Khurana and Tomer worked out what properties that building block would need to have, they found that it resembled a one-way function with a perplexing mixture of quantum and classical characteristics.
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