Linked Questions

6
votes
4answers
22k 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 ...
9
votes
1answer
2k 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 ...
11
votes
2answers
1k 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 ...
2
votes
1answer
140 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?
1
vote
1answer
289 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 ...
3
votes
2answers
156 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 ...
3
votes
1answer
184 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 ...
1
vote
1answer
340 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, ...
4
votes
1answer
167 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 himself to explain how quantum key exchange process works ...
0
votes
2answers
158 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?
-2
votes
1answer
181 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?
3
votes
0answers
132 views

Information-theoretically provable Privacy Amplification?

In Quantum Key Distribution, the distributed key is produced by Privacy Amplification (also known as key distillation). An ID Quantique whitepaper introduces it with a Rudimentary Privacy ...
2
votes
1answer
78 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 ...
0
votes
1answer
67 views

Is this man in middle atack possible in quantum cryptography? [duplicate]

Lets consider there is channel between Alice and Bob, sequered with quantum cryptography. To put it simple, Alice is left, Bob is right and the quantum states are 'up' ~ U and 'down' ~ D. Alice ...
1
vote
1answer
34 views

What happens after sharing the secret key in quantum cryptographic schemes to send the message bits?

As a person working on the physics perspective of quantum communication, I understand the process upto which the quantum key is shared securely. What happens after this process to send message bits? ...