Quote: seal data by generating a large checksum by a secret method; can't change the data without invalidating the checksum

Quotation Skeleton

[(Science Citation Index abstract):" The method described generates a qualified checksum (18 digits) from the data that is to be stored. The method of generating the checksum is secret; thus it is not possible to alter the data stored without making the checksum untrue.   Google-1   Google-2

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