# Tag Info

## Hot answers tagged cryptography

Accepted

### Is it possible for an encryption method to exist which is impossible to crack, even using quantum computers?

The title of your question asks for techniques that are impossible to break, to which the One Time Pad (OTP) is the correct answer, as pointed out in the other answers. The OTP is information-...
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### Is it possible for an encryption method to exist which is impossible to crack, even using quantum computers?

I suppose there is a type of encryption that is not crackable using quantum computers: a one-time pad such as the Vigenère cipher. This is a cipher with a keypad that has at least the length of the ...
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### Is quantum cryptography safer than classical cryptography?

If you are talking specifically about quantum key distribution (quantum cryptography being an umbrella term that could apply to lots of stuff), then once we have a quantum key distribution scheme, ...
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### Is it possible for an encryption method to exist which is impossible to crack, even using quantum computers?

Yes, there are a lot of proposals for Post-quantum cryptographical algorithms that provide the cryptographic primitives that we are used to (including asymmetric encryption with private and public ...

### Advantage of quantum key distribution over post-quantum cryptography

Quantum key distribution requires that you wholesale replace your entire communications infrastructure built out of 5 EUR ethernet cables and 0.50 EUR CPUs by multimillion-euro dedicated fiber links ...
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### Can a quantum computer break quantum cryptography?

This is a good question that highlights the unfortunately broad use of the term "quantum cryptography". Either way, the TL/DR of it is that, although quantum computers break many currently ...
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### Rigorous security proof for Wiesner's quantum money

Abel Molina, Thomas Vidick, and I proved that the correct answer is $c=3/4$ in this paper: A. Molina, T. Vidick, and J. Watrous. Optimal counterfeiting attacks and generalizations for Wiesner's ...
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### Advantage of quantum key distribution over post-quantum cryptography

If it is proven that a given asymmetric encryption protocol relies on a problem which cannot be solved efficiently even by a quantum computer, then quantum cryptography becomes largely irrelevant. ...
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### Are there any encryption suites which can be cracked by classical computers but not quantum computers?

This is not a very enlightening concept, because most interesting quantum algorithms, such as Shor's algorithm, involve some classical computations as well. While you can always shoehorn a classical ...
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### How is quantum cryptography different from cryptography used nowadays?

Quantum cryptography relies on elaborate physical machinery to execute cryptographic protocols whose security rests upon axioms of quantum mechanics (theoretically, anyways). To quote the wikipedia ...
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