Linked Questions

14
votes
3answers
2k views

Why Quantum Key Distribution (QKD) is impractical

In NSA's FAQ on Quantum Computing and Post-Quantum Cryptography, it is mentioned as Q: Should I use a QKD system to protect my NSS from a quantum computer? A: No. The technology involved is of ...
11
votes
4answers
32k views

How is the key shared in symmetric key cryptography?

Symmetric key cryptography is an encryption system in which the sender and receiver of a message share a single, common key that is used to encrypt and decrypt the message. Is the key public or it is ...
12
votes
2answers
2k views

Dice vs quantum random number generator

I recently championed quantum key distribution networks. This has led me to also question quantum random number generators. It appears that randomness is randomness, even if made by custom quantum ...
11
votes
1answer
3k views

Is quantum key distribution safe against MITM attacks too?

i read this recently: http://www.newscientist.com/article/dn12786-quantum-cryptography-to-protect-swiss-election.html and some parts of this: http://en.wikipedia.org/wiki/Quantum_key_distribution ...
2
votes
1answer
194 views

Quantum Cryptography Used in a messaging application

Is it possible to create a messaging application and apply a quantum cryptography technique to encrypt the messages between two parties within the application?
2
votes
1answer
352 views

What is Quantum Cryptography?

When it comes to exchanging secure information over an insecure channel, this approach is considered. It all depends on the nature of photons in which the third polarization is focused. It can easily ...
5
votes
1answer
333 views

Understanding Quantum Key Distribution

I have watched dozens of videos on YouTube talking about quantum cryptography and how the BB84 algorithm works. However, none of them bothered to explain how the quantum key exchange process works in ...
4
votes
1answer
245 views

Can quantum computers break quantum cryptography?

I happened to learn that encryption by quantum cryptography would be impossible to break as it's state changes the instant of an eavesdropping event(by non-quantum systems) occurs. But I'm not sure if ...
3
votes
2answers
232 views

challenges in quantum key distribution

Quantum key distribution (QKD) promises unconditional security in data communication and is currently being deployed in commercial applications. Nonetheless, before QKD can be widely adopted, it faces ...
5
votes
2answers
469 views

What are the current known weaknesses/attacks on quantum key distribution?

I am writing a paper on the implementation of QKD in the future. I want to know if there are any viable attacks on the BB84 protocol or QKD in general? I know of the Photon Number Splitting attack or ...
0
votes
2answers
287 views

Post-Quantum cryptography usability in IoT devices

My question is very simple. Can I use Post-Quantum encryption/decryption algorithms in IoT devices such as RaspberryPi, Arduino etc, or should the hardware infrastructure obey in quantum logic?
1
vote
1answer
362 views

How exactly works the quantum communication done by China?

This video and this article announced that spacial quantum communication were finally done using satellites. As a recap, when two particles are entangled, if a measurement is done to one of them, ...
-2
votes
1answer
188 views

Quantum key distribution

Is there a minimum limit for No. of photons that Alice would send to Bob in a QKD scheme like BB84? If not than what would be a desirable length for initial qubit string?
1
vote
1answer
104 views

Has anyone implemented the BB84 protocol?

Has anyone implemented the BB84 protocol and put it in production? The BB84 is a quantum key distribution scheme developed by Charles Bennett and Gilles Brassard in 1984. It is the first quantum ...
2
votes
1answer
94 views

How do quantum key distribution systems tolerate noise?

It seems to me that any noise in the signal would result in Alice and Bob generating different keys, without a simple way to tell the difference. How do quantum key distribution systems tolerate ...

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