Successful attack on quantum cryptography

Quantum cryptography, based on Heisenberg's uncertainty principle, is supposedly a bulled-proof solution against eaves-dropping.  However, as it is the case with mathematical encryption solutions, it is not the math or quantum physics, it is the implementation that causes issues.

"Computer scientists have pulled off what is claimed to be the first successful attack against a commercial system based on theoretically uncrackable quantum cryptography."

In a world without communication errors, this is supposed to work but guess what, we are not in a perfect world :)

"In practice, however, it is not possible to completely eliminate errors in electronic communications because of factors such as noise and signal degradation. So practical systems accept key exchanges where the error rate is less than 20 per cent."

Here's the article

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