# How NSA can decrypt ciphers with 1024 bit keys?

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    <a href="http://www.scottaaronson.com/blog/?p=2293">Here</a> is the complete story.
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    The story is: Most of today's secure network data transfers (e.g. when you enter your credit card number in a website), is done based on protocols which are using Diffie-Hellman algorithm. This algorithm's implementation uses some fixed numbers as its input parameters.
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    NSA (supposedly) has pre-calculated different computation results for the single most common used parameter and using this set of pre-calculated data (plus several hundred CPU cores), it can decrypt text which is encrypted using 1024 bit keys.
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    If you use 2048 bit keys they will not be able to do this but currently most of client and server applications are pre-configured to use this type of key. 
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