Verifiable removal of item of confidential information from data of a record

A non-transitory computer-readable medium storing computer code for determining that an item of confidential information has been removed from a record, the computer code including instructions to cause a processor to:

• copy the record from a first set of memory cells to a second set of memory cells;
• determine that a field, of the record, has the item of confidential information, the item of confidential information represented by an original value;
• calculate a replacement value, the replacement value being a value of a transformation function applied to a value of the field, the value of the field being the original value or an interim value, the replacement value being testable for an existence of a digital signature, the digital signature to be derived from the replacement value;
• and
• replace the value of the field with the replacement value,
• wherein the record, in which the value of the field has been replaced with the replacement value, is to be used for a test, the test being of a characteristic of an application, and
• wherein an ability to derive the digital signature from the replacement value is an indication that the item of confidential information has been removed from the field.

A system for determining that an item of confidential information has been removed from a record, the system comprising:

• a memory configured to store the record;
• and
• a processor configured to:
• copy the record from a first set of memory cells to a second set of memory cells;
• determine that a field, of the record, has the item of confidential information, the item of confidential information represented by an original value;
• calculate a replacement value, the replacement value being a value of a transformation function applied to a value of the field, the value of the field being the original value or an interim value, a digital signature derivable from the replacement value;
• and
• replace the value of the field with the replacement value,
• wherein the record, in which the value of the field has been replaced with the replacement value, is to be used for a test, the test being of a characteristic of an application, and
• wherein an ability to derive the digital signature from the replacement value is an indication that the item of confidential information has been removed from the field.