SHA1 It Ain’t So! Beating A Dead Horse Into Hash
SHA1 Is Dead! Long Live SHA1
We have known for several years that SHA1 hashes are vulnerable to collision attacks which can be used to unencrypt the data which uses it and many applications have phased it out over the past five years. Unfortunately many sites, like Git, still make use of it for content or handling HTTPS traffic, the open source version of PGP called GnuPG still uses it for keys and TLS and Secure Shell will still accept it. The only good news Ars Technica has to offer is that it is still rather expensive to exploit, however the price is now less than half of what the original exploit would cost you.
Drop by for a deeper look into SHA1, collision vulnerabilities and how the price tag was determined, if you dare.
The attack unveiled on Tuesday also costs as little as $45,000 to carry out. The attack disclosed in 2017, by contrast, didn’t allow forgeries on specific predetermined document prefixes and was evaluated to cost from $110,000 to $560,000 on Amazon’s Web Services platform, depending on how quickly adversaries wanted to carry it out.
More Tech News From Around The Web
- Rowhammer rides again as FPGA attack, RSA again reportedly up for sale, anti-theft kit to nuke laptops, etc @ The Register
- Disney+ Titles Disappear Without Warning, Bringing Confusion To The Streaming Wars @ Slashdot
- Embedded DNA used to reproduce 3D-printed rabbit @ Physicsworld
- The Biggest Problems With Bluetooth Audio Are About To Be Fixed @ Slashdot
- Linux in 2020: 27.8 million lines of code in the kernel, 1.3 million in systemd @ The Register
- DMCA-Locked Tractors Make Decades-Old Machines The New Hotness @ Hackaday
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SHA1 isn’t an encryption algorithm, it’s a hash function. It’s used for creating a ‘digest’ of a message. Unlike an encryption function, a hash function is not meant to be easily reversable.
Asking for a friend.
or is this?
Anyone know the markup that the new comment system uses?
umm, not really? Also, better description of SHA1 than in my blurb 😉
blockquote is what you want on this one
[blockquote] This is with square brackets[/blockquote]
> This is just with a single angle bracket.
Thanks for the reply, Jeremy! MHU if you ever have crypto questions.
When did I get a face? Can I edit that?
Updates apparently. I don’t see how to edit them at this point.
Make sure the email you use for comments has a corresponding one in Gravatar.
I see …
What do you see? 🙂
How the new avatar system works on the new wide open comments
My god! It’s full of stars!
Okay, I created a WP account so I could create a gravatar account. Then I uploaded my avatar. I’m not seeing it here, yet. But, I did see this when I logged into my account: “WordPress 5.3.2 is available! Please notify the site administrator.”
So, that’s something. 🙂
And there it is! Cool!
Do you have to post to a page to get it to update the avatars? I.E. does WP cache a generated page when a new comment is posted and not update it until another comment is made?
I’m seeing yours now. Mine took about 5 mins to kick in.
Thanks, it was popping in and out every other time I’d refresh a page, so i got to speculating why. I assume you have a few backend server boxes that don’t all pick up the new images at the same time. Seems good now. Sort of surprisingly, I’ve found a few other websites I comment at seem to be using gravatar as well as I now have an avatar at them as well. I wish someone had pointed this out to me years ago. 🙂
Thanks, Jeremy!