Two things.
1. How does software tie it to the other data if it's sliced out? Data entry is putting data in. If the data isn't linked prior to the person entering it then the only person who can link it IS the person entering the data. And if the data is already linked, why bother entering what's already there?
To do this the following must happen:
1. A hand written, mailed in Medicare Continuation Coverage (or whatever) form is scanned into a flat file .png file.
2. Software slices out the SSN, Full Name, Address, and other form fields into individual .png files and creates a hidden unique key in the meta-data information.
3. Through the Data Entry application DataEntryWorker1 is randomly presented a series of SSN images and must enter them into an input field. The hidden metadata key from the SSN's .png is also submitted with the ASCII input field text, so that the database in the background knows that SSN1.png, the ASCII SSN, and the metadata key all belong to each other.
4. Another Data Entry user, DataEntryWorker2, is randomly presented a series of Full Names and must enter them into an input field.
Since the Full Names have the same key as the SSN's, once they get into the database it will all tie together, and the data can be recompiled. This is MORE SECURE. No one knows which SSN belongs to which Name, and so no identities can be stolen. This system also allows the possibility that people further down the line in that department, or other in government departments, can pull up people's files with the SSN being hidden from their view, tied together in the background databases by software.
2. You had suggested a scanned image. Why? OCR with fairly simple coding means you can just scan a document and have the data entered automatically. We do it in the NYS School system.
1. OCR coding is not that advanced to recognize universal handwriting. Data Entry workers are already needed to decipher handwriting. Even our primitive OCR technologies which already exist need to be doublechecked by a human.
2. Separating the SSN, DOB, Name, Gender, State, County, etc, from the data and tieing everything together with a key in the background can can allow federal workers to look up a person by their other factors.
Reviewers can email or fax around files abut a person without needing to stamp JOHN SMITH SSN: 123-45-6789 at the top of that file, as many government agencies do internally. All they have to do is reference "John Smith KEY: 2ABC-C344-3993". In fact, they don't even need to identify the user by their name anymore. They can just identify the user by their key, which contains the name and social in the backend.
Since the SSN has turned into a financial instrument over the years, the lookup system will restrict who it shows SSN's to. Instead it looks people up by their unique keys, as the SSN system was originally intended for.
The government would be doing something like this if they were truly concerned about privacy, if not rework the SSN system altogether.