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Quantum Key Distribution – Explained

QNu Labs   |   Apr 14, 2023

Before understanding Quantum Key Distribution (QKD), let us understand quantum cryptography. Cryptography is the process of encrypting and protecting data such that only the person with the right secret key can decrypt it. Quantum cryptography is a process of encryption using properties of quantum mechanics to transmit data securely, making it hack-proof.

The definition sounds simple, but the underlying quantum principles are complex. Instead of understanding the overwhelming details, let us conclude that quantum cryptography safeguards data against all possible threats–including an attack by a quantum computer.

A quantum computer can break the widely used RSA encryption protocol in a few seconds. The threat of a quantum attack on our existing communication channels looms large. Quantum cryptography is the only possible solution to this problem.

If quantum cryptography is the process of encryption, QKD is the method of achieving it

QKD is deployed over traditional communication channels. It acts as a protective layer on the known cryptographic processes that govern data communication today.

How does QKD work?

QKD establishes a shared, secret and random sequence of bits to communicate between two systems, let us say, Alice and Bob. After this key is shared between Alice and Bob, further exchange of information can take place through known cryptographic strategies.

QKD works on the quantum principle of entanglement. The two quantum particles are correlated such that the state of one particle affects the state of the other particle, even when they are separated by a large distance. In QKD, the two parties, Alice and Bob, use a pair of entangled particles to establish a secure communication channel.

Photos are the quantum particles used in the shared key. Any attempt to intercept or measure the photons during the transmission would disturb their state, and the disturbance would be detected by Alice and Bob, alerting them to the presence of an eavesdropper.

Armos - QKD

Armos is a state-of-the-art device engineered using the principles of quantum mechanics by the experienced team at QNu Labs.

Armos uses a series of randomly generated photons in a quantum state to exchange quantum information. They produce the same key at both ends of the cable.

An attempt to read the quantum state of a photon causes the keys to collapse. Subsequent key generation stops and the admin is notified of a possible attack on the channel. The simultaneous generation of keys at both ends makes eavesdropping a futile exercise.

Armos fully encapsulates quantum principles and provides a robust technology you can trust.

Applications of QKD

QKD provides a secure communication channel that is immune to cyber-attacks. Some of the industries in which QKD applies are:

A step ahead

Armos-QKD serves multipurpose encryption requirements.

Irrespective of the industry your business belongs to and regardless of your specific security requirements, Armos can be your go-to product.

The Symmetric Key Encryption mechanism employed by Armos ensures keys are never exchanged over the network.

Unconditional security resides on the principle of concurrent key generation at both ends of the channel.

If you need unbreakable security, you need Armos.

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