Questions tagged [quantum-computing]
A computation model which relies on quantum-mechanic phenomena, such as entanglement and superposition. This generalizes the probabilistic model of computation.
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Why are quantum-proof cryptography algorithms being developed?
I noticed some new quantum cryptography algorithms are being developed.
I know very little about quantum computing but my understanding is that it will just be a much more powerful computer and ...
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Are Memory-Hard Functions de-facto quantum resistant?
Searches have returned absolutely no results on this question. With that in mind, I assume the answer is either painfully obvious ('of course quantum computers get no advantage when it comes to ...
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Breaking the Even-Mansour Cipher with Quantum Period Finding: Probability of unwanted collision
The paper Breaking Symmetric Cryptosystems using Quantum Period Finding shows how to break the Even-Mansour Cipher using Simon's algorithm. The Even-Mansour uses two keys $k_1, k_2$ and a random ...
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AES and quantum computing
I am trying to understand the AES-256 encryption algorithm as it would be implemented on a gated quantum computer (actually, a simulator), and I am having some trouble understanding the theory behind ...
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Factoring 2048-bit integer with quantum computer?
In this paper, there is a statement in the abstract:
Our construction uses $3n + 0.002n \log(n)$ logical qubits, $0.3n^3 + 0.0005n ^3\log(n)$ Toffolis, and $500n^2 +n^2 \log(n)$ measurement depth to ...
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Can an adversary distinguish QROM from ROM with a single query?
I acknowledge that QROM differs from ROM (which can be considered as a specific QROM which performs a measurement to the input). For example, one can find a preimage for an arbitrary value with $O(N)$ ...
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QKD measuring qubit with wrong bases
I'm trying to end the research work for my master thesis about BB84 QKD (and QBC) and a basic problem of quantum mechanics is blocking me.
I'm trying to do a probability calculus of the action of ...
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A question about performing quantum computations on uniform superpositions
Let us consider the following situation. Let $U_f$ be a gate computing $f$ mapping $\{0,1\}^n$ to $\{0,1\}^n$. That is, $U_f\left\vert x,0^n\right\rangle=\left\vert x,f(x)\right\rangle$. Let $\left\...
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What are the misconceptions of IBM's CEO Arvind Krishna talk on the "Axios on HBO" about the quantum computing
IBM CEO Arvind made a talk in HBO's Axios program. It seems that there are misconceptions/misleading/flaws in reasoning etc.
What are those!
Some of the details of the speech is given as;
IBM says ...
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What is the current situation of quantum computers?
Like other research areas of cryptography, quantum computing consists of hidden and open fractions. Apparently, we can't say certain things about governments' capabilities where academical or ...
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What are some "must-read" papers for someone getting into Quantum Cryptography? [closed]
I'm a graduate student that just finished a first course on quantum computation. I've also done a graduate-level course in (classical) cryptography.
I'm interested in Quantum Cryptography and would ...
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Differences between Extractors and Privacy Amplification for Quantum Random Generators
We know that for the last step of QRNG: we need to separate quantum and classical noises from each other so we use extractors, after extractor we need privacy amplification step. At this point: if ...
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Is Mega.nz encryption vulnerable to brute force cracking by quantum computers?
I am interested in Mega.nz cloud storage.
It is using end-to-end encryption.
It says that it uses AES-128 to encrypt files
And there are more details in their white paper
But I saw that quantum ...
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Using two or more encryption algorithms together, how do we compute the strength of the final encryption?
If two or more encryption algorithms are used together, how do we compute the strength of the final encryption?
And how would the application perform against quantum computers?
The first two tables ...
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Are MAC algorithms and digital signatures secure from quantum computers? If not, why?
I understand that asymmetric encryption is fundamentally deemed useless under Shor's Algorithm, and understand that symmetric encryption is somewhat quantum-resistant as long as the key-length is ...
