Which is exactly why I said, "...an alternative system needs to be put in place before releasing the database."
I wasn't saying that using SSNs they way they're currently used is a good system or even that it works halfway decently. I was saying your plan for the SSA to break the world would also fundamentally break the original purpose for the SSN and hurt themselves. The IRS and SSA need to get together and devise a better system for authenticating citizens and resident aliens before even contemplating taking that step.
What I'd like to see them do is get NIST involved and run it as a public challenge the way they have with the various encryption standards. Get competing strategies proposed and let cryptographers rip them to shreds until something acceptable is left over. Incidentally, we should also do the same thing with voting machines to create a standard which vendors can implement and sell to local election commissions.
> Besides, the IRS has been dealing with endless attempts at tax fraud for a century and a half now
Former Intuit employee here...not in tax, but I've worked with people who are and learned a lot about anti-fraud programs. Acting like this is an old problem is disingenuous. The advent of e-file has made the problem massively worse. Releasing the entire database would make it, turn, significantly worse. I can guarantee you that Intuit, H&R Block and the other online tax filing solutions have been in contact with Equifax to get the full list of (or full list of hashes of) SSNs that were compromised and that returns for those SSNs will undergo increased fraud scrutiny. Equifax only leaked around 1/3 of all SSNs, so your plan to release the full list would create far more than background noise.