Saturday, 24 August 2013

Is size Q equal to size SHA(Q)?

Is size Q equal to size SHA(Q)?

Assume d is a 128 bit random integer and P is base point of an elliptic
curve and Q = dP is a point on the elliptic curve and SHA is a hash
function with 128 bit output, my question is:
Is size Q equal to size SHA(Q)?
If not, then wich is smaller size?

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