After too many operations, the ciphertexts would eventually become too noisy.

经过过多的运算操作，暗文将最终变得杂乱无章。

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And Fisher is taking good care of operations -- when his mom complained about that noisy line from Tel Aviv, he got on the case.

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Since these operations are expensive to pull off, assets are not wasted on noisy DDoS attacks.

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