A hashing method and system. The method comprises receiving by a computing system first source data. A first hash function is applied to first source data. A first hash output is generated by the first hash function as a result of applying the first hash function to first source data. The computing system performs an operation relating the first source data with at least a portion of the first hash output to generate second source data. The first hash function is applied to the second source data. A second hash output is generated as a result of applying the first hash function to the second source data.