Calculating very large exponents in python

[Fahad Ahmad]

Dear All,

i am writing my crytographic scheme in python, i am just a new user to it. 
I have written the complete code, the only point i am stuck it is that i am using 256 exponentiation which is normal in crytography but python just hangs on it.

g**x  [where both g and x are 256 bit numbers , in decimal they are around 77]

after reading several forums, i just come to know it can be done using numpy, i have installed python(x,y) has has both numpy and scipy installed but i am not able to make it happen.

any idea which library, module, or piece of code can solve this mystery :S

sorry for bad english

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