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Bit-security of ISIS based cryptosystem

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I am currently working on an ISIS based signature scheme cryptosystem. I am trying to evaluate the bit-security of my construction. To do so, I try to calculate the number of operations needed in BKZ reduction.

I think I was able to find the right formula to calculate the total time complexity of BKZ. However, how do I get the bit-security from this result? This might be a silly question, but I am not sure if I should only divide by one operation time and then use logarithm... and if so, I don't really know what the time for one operation in BKZ value would be...

Thank you for your help.

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