# The future of the vast oil and gas industry depends on blockchain

Innovative oil and gas companies are leveraging blockchain, but the industry as a whole may be slow to adopt the technology.

Pre-Image Resistance of repeated, patterned SHA2-256 digests

Suppose $$H = operatorname{SHA2-256}$$.

Let $$H_1 = H(text{“Alpha1”})$$.

Let $$H_2 = H(text{“Alpha2”})$$.

Let $$H_N = H(text{“AlphaN”})$$.

So all these digests are based off a common pre-image post-fixed with the index.

Question 1: Does knowing the values $$H_1, dotsc, H_N$$ and the length of common pre-image substring “Alpha” leak any information about “Alpha”?

Question 2: Would double-hashing make any significant difference to pre-image security? E.g.: $$H_i = H(H(text{“Alpha”} mathbin| i))$$

#### The future of the vast oil and gas industry depends on blockchain

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