Tag: Device-Independent Quantum Key Distribution

Device-Independent Quantum Key Distribution (DIQKD) is the art of using untrusted devices to distribute secret keys in an insecure network. It thus represents the ultimate form of cryptography, offering not only information-theoretic security against channel attacks, but also against attacks exploiting implementation loopholes.
—Nature Communications, “Device-independent quantum key distribution with random key basis”

Quantum Key Distribution (QKD) is a secure communication method which implements a cryptographic protocol involving components of quantum mechanics. It enables two parties to produce a shared random secret key known only to them, which can then be used to encrypt and decrypt messages. It is often incorrectly called quantum cryptography, as it is the best-known example of a quantum cryptographic task.

An important and unique property of quantum key distribution is the ability of the two communicating users to detect the presence of any third party trying to gain knowledge of the key. This results from a fundamental aspect of quantum mechanics: the process of measuring a quantum system in general disturbs the system. A third party trying to eavesdrop on the key must in some way measure it, thus introducing detectable anomalies. By using quantum superpositions or quantum entanglement and transmitting information in quantum states, a communication system can be implemented that detects eavesdropping. If the level of eavesdropping is below a certain threshold, a key can be produced that is guaranteed to be secure (i.e., the eavesdropper has no information about it), otherwise no secure key is possible and communication is aborted.
—Wikipedia, “Quantum key distribution“

Articles / CyberSecurity

Fully Device Independent Quantum Key Distribution

Communications of the ACM, April 2019
Research Highlights : “Technical Perspective: Was Edgar Allan Poe Wrong After All?”
By Gilles Brassard

Research Highlights : “Fully Device Independent Quantum Key Distribution“
By Umesh Vazirani, Thomas Vidick

“Artur Ekert realized as early as 1991 that a different kind of quantum cryptography was possible by harnessing entanglement, which is arguably the most nonclassical manifestation of quantum theory. Even though Ekert’s original protocol did not offer any security above and beyond my earlier invention with Bennett, he had planted the seed for a revolution. It was realized by several researchers in the mid-2000s that entanglement-based protocols could lead to unconditional security even if they are imperfectly implemented—even if the QKD apparatus is built by the eavesdropper, some argued. For a decade, these purely theoretical ideas remained elusive and seemed to require unreasonable hardware, such as an apparatus the size of the galaxy! Vazirani and Vidick’s paper provides an unexpectedly simple and elegant solution, indeed one that is almost within reach of current technology. Once it becomes reality, codemakers will have won the definitive battle, Poe’s prophecy notwithstanding.”