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what do you guys think, does it give you any cause for concern?
No, because quantum computing is not practical. As far as I am aware the largest number a quantum computer has ever factored using Shor's algorithm was 21.
Lot's of tech is impractical until, with R&D, it becomes practical
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Generally agreed, but look at the progress of quantum computers: In 2001 the number 15 was factored with Shor's algorithm on a quantum computer. In 2012 Shor's algorithm was applied on a quantum computer to factor 21. And now it is the year 2025 and we are still on 21. In practical cryptography we use numbers that are about quattuorvigintillion times larger.
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Sure, but breakthroughs are unpredictable by nature. And we can't even prove mathematically that our cryptography is secure against classical computers or a guy with a pen and some paper.
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