‘Tar Baby’ Permutations

February 10, 2015

tarbabyFor an adversary attempting to extract some pre-image of x , an error of one unit in relative most significant place (RMSP) results in an immediate ‘out of parameter’ (OoP) function condition. At fourteen decimal places of precision however, a single error in one unit of last place (ULP) for this function, takes at least 25 iterations to dilate OoP at RMSP. Superficially, the correlative security weakness of RMSP decimals appears to hold out promise of correlation attack through simple key probing in incremental order of significance. As to discover the longest ‘in parameter’ lag sequence. Therein lies complexity, Lah numbers and sticky predicates.

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