Q: How can we be sure that post-quantum cryptography really provides protection, if the wide-scale use of quantum computers is s
23 Jun 2023, 08:30
Q: How can we be sure that post-quantum cryptography really provides protection, if the wide-scale use of quantum computers is still a long way off?
Answer: To understand whether post-quantum cryptography works, it is not necessary to have a ready-made quantum computer. We can already evaluate the efficiency of such algorithms using mathematics.
What does this mean?
Let's put it in layman's terms:
In classical cryptography to speed up the process it is necessary to store in memory only the current iteration of data, whereas in post-quantum cryptography it is necessary to store all of the intermediate data. The volume of this data grows exponentially, and a quantum computer needs to store it in memory. We are talking about billions of qubits - modern quantum computers are still far away from having such a capacity.
In any case, it should be kept in mind that even post-quantum protection is not absolute. It is a solution that will be viable for about a hundred years, and is suitable for "normal" communication lines. The next stage of technology is quantum communication lines and quantum cryptography, which are currently still in the embryonic stage of their development.
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