US Patent 10102398 Generating obfuscated data

A method for obfuscating data includes: reading values occurring in one or more fields of multiple records from a data source; storing a key value; for each of multiple of the records, generating an obfuscated value to replace an original value in a given field of the record using the key value such that the obfuscated value depends on the key value and is deterministically related to the original value; and storing the collection of obfuscated data including records that include obfuscated values in a data storage system.