cryptoProhard

SpiralFloats

0xl4ugh

Task: Recover flag from masked output of a spiral function over real numbers. Solution: Invert the monotonic spiral function using Newton's method and brute-force the remaining masked digits with constraint propagation from the flag format.

$ ls tags/ techniques/
brute_forceprecisionreal_number_arithmeticspiral_functionnewtons_method
constraint_propagationfunction_inversioniterative_solving
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