2017-Jun-12, Monday

mindstalk: (Miles)
So, about my new job! (This will be a bit like a paid ad, insofar as
I'm talking about stuff I'm paid to do.)

Ever worried about someone stealing your pictures? Have you ever worried that all CCTV video surveillance streams could be easily edited? (Are you worried about it now that I've brought up the issue?) Have you ever noted that email has a Date field, which can be edited at any time to be anything, as can the whole email? That leaks of digital documents could easily be altered, or complete forgeries?

There's a fix for that! More than one, actually. The manual way is to make a cryptographic digest of your file and publish it somewhere not editable or revocable -- newspaper ads, bank transactions, something like that. No one knows how to readily forge a file to produce a digest, so if you later present a file that produces that digest, known to have existed at some earlier date, that pretty much proves the file existed then, without subsequent alteration.

But that's a pain. Kinnami's AmiStamp product aims to make it much more easy and scalable. Our client can scan your specified directories or files, send us the digests, and we tie those together, publishing a master stamp periodically. You can get a certificate from us, which is a list of digests, and later prove that your file + those digests = the master stamp. Again, digesting is one-way, so if our master stamp existed on 2017 June 11, and your file can be part of re-creating that stamp, then your file almost certainly existed, as is, on 2017 June 11. We tie it to your credentials too, further establishing that you possessed the file.

We're not a legal notary public service; while we link stamps to a user's alleged credentials, we don't certify that the user is legally that person. We certify that account id #4267 with alleged credential "John Doe" had a file, but not whether account id #4267 actually is "John Doe".

Signing up is free for anyone, and you get 500 free stamps with that. Paid Personal is $10/year, and adds another 10,000 stamps/year. Plus some special offer for students. If you just need to stamp a few files, or tar/zip lots of files and stamp the tarball, 500 should be plenty; our hope is that stamping will be so cheap and convenient that you just let our client automatically scan and stamp large swathes of your home directory, thus the large numbers.

Applications: stamping your photos, your blog posts, your research files, emails, notes you're taking on your abusive boss, notes you're taking on your feckless employee... anything where you might want to prove "I had this, as is, then."

There's a more detailed User Guide on the site, but at the moment you have to sign up to read it. We should get that changed soon, but I'm not the webmistress.

Edit: no Linux client yet, though. Could release a CLI one easily enough, but GUI takes more work.

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