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It was more in terms of comparison with security strength vs key length. For example, 3072 bit RSA keys are equivalent in security strength to 128-bit symmetric keys. To reach 256-bit security strength equivalence, you need 15360-bit RSA keys. [1](Page 63)

1. http://csrc.nist.gov/publications/nistpubs/800-57/sp800-57-P...

I hadn't thought of it that way. Thanks for the clarification.

Also I think my numbers are correct, for every double of key length size in RSA, it is 8x more expensive to compute.

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