Crypto Anchors: Exfiltration Resistant Infrastructure

1. Generate 16TB of random data, backup/replicate many times

2. Think of data as 16 billion 1k pieces

3. Generate 64 random piece addresses using hashA(key) as seed

4. Concatenate the 64 pieces into one 64k chunk, and store hashB(chunk)

The approach has an economy of scale where a shared pool can secure many sites' hashes at very low cost to individual sites, but where the sum-total can fund a very large data pool. I would love to grow this to 1PB and beyond. The idea behind the patent is to give us a chance to try to grow exactly that service.

Fundamentally the technique is quite simple and easy to copy, yet IMO it is better than computational/iterative hashing in every way -- cost, performance, scalability, and security. It seemed to me a perfect example of something worth patenting. If we're ultimately not successful in commercializing it, I would want to relinquish the patent to the public domain.

The most important part -- and what's kept me working at this for years now -- is that it protects even weak passwords after a company is breached. It takes the onus (and a lot of the blame) off the end user, and solves the usability problem with passwords.

By the way, the same technique works equally well for adding BlindHash to your KDF used to decrypt your SSH key, or your laptop or your TrueCrypt volume. We can also add additional checks when running the BlindHash call for a given AppID to enforce things like;

1. must first rely to an SMS or enter a TOTP code 2. Request must come from a certain IP range or during certain hours 3. Request only valid after date X (time lock)

So this can be used to shore up password-based encryption as well in some very interesting ways.

This technique could have been invented and promoted starting in 1997 (20 years ago) but only through the protectionism of the patent regime do you have this beautiful write-up and promotion of it by researchers pushing it forward: it's the patent regime working in action.

It works EVEN WITH WEAK PASSWORDS. That is pretty amazing if you ask me.

I am glad they patented it and are promoting it.

"But wait, it's so simple".

Let me give you an example of a $684.23B company that you've heard of that is making a mistake in security that even a small child could detect and correct, but for which there is no proprietary solution in the space pushing them forward.

The company is Google and their silly security mistake is that when I give out "jsmith543+weeklytechupdate@gmail.com" where my true address is jsmith543@gmail.com, and I'm signing up for the Weekly Tech Update newsletter but I'm afraid they could start spamming me, or sell my address for any number of third parties to start spamming me, then this allows the creation of a gmail inbox that tags the incoming mail with "weeklytechupdate". Pretty clever. Only the issue is that it is possible to strip the +____ and spammers actually do that. Here are examples of HN people saying they actually do that: https://news.ycombinator.com/item?id=15396446

>I’ve run a fair amount of email campaigns where we strip out the + if gmail is the domain to ensure it doesn’t end up in some weird filter.

The solution is extremely simple. Allow me to specify a key-value pair from the GMail interface that generates a high-entropy key, and pairs it to a value I choose. Deliver all address to that key to my inbox, tagged with the value I chose, until I start marking it as spam. Very easy. Example: I go to gmail, I click "generate rescindable read address address", I am given affj3fjd and I assign it "weeklytechupdate". I see that affj3fjd@gmail.com gets assigned to weeklytechupdate and if I need to give my email address to that web site in the future I can always look it up in some list. Easy. Gmail doesn't do it, and its spam solution is broken.

The only thing is: nobody has come up with something clever enough to patent in this space, and then promote the @#$# out of. If they had, I could give my email addresses out in confidence to whoever I want.

Actually I made a full gmail email address dedicated only for spam. The problem is I can NEVER read the stuff that goes there as I just don't even look. I just looked. The last piece of spam that I got delivered to it occurred 7 days ago. There are just 2 pieces of mail in my inbox.

That means Google's spam filter is very, very, very good. Wait, what? So good that it silently filters spam that I expect to get, that I explicitly give out my email address for? (Okay, I just looked, and there are 2 messages from 4 days ago - nothing more recent - in the "promotions" tab).

No. It's not what it means. It means that some of these sites I give my address out to aren't able to email me at all. They're just not getting through, because GMail's spam fiters are too draconian.

When I give out "jsmith543+weeklytechupdate@gmail.com" I expect ALL of the mail sent to there to go through - not to be caught by the spam filter. Instead, presumably what happens is gmail throws away most mail that isn't sent to an individual by an individual.

Sorry to rant on this aside, I just wanted to show, in action, the difference between a patented solution that a company promotes, versus an EASY solution that would WORK, that GMail doesn't do. It actively does something broken. Nobody has come up with and promotes some fancy solution that works, so instead they don't use the weak solution that works; they use nothing, only a broken non-working security through obscurity solution that you can see HN'ers actively strip out in order to be able to spam effectively.

And this is Google. So this is a question as clear as day for why I don't mind patented novel algorithms with companies behind them licensing and promoting them. I kind of mind when it's a race to the patent office with new technology, but grandparent poster's technique is one that could have been done in 1997 so I don't really buy that excuse. I like that they're patenting it and promoting it. It's a good way to get companies to use better solutions. Companies just don't do it by themselves, as my Google example shows.

Generating the data pool with constantly cycled and discarded keys (i.e. /dev/urandom) means the only way to have the pool is to go and get every single bit of it.

We went the second route because I like sleeping at night and it just felt like retaining a seed would defeat the whole purpose of bounded retrieval.