Technology

58166 readers

3411 users here now

This is a most excellent place for technology news and articles.

Our Rules

Follow the lemmy.world rules.
Only tech related content.
Be excellent to each another!
Mod approved content bots can post up to 10 articles per day.
Threads asking for personal tech support may be deleted.
Politics threads may be removed.
No memes allowed as posts, OK to post as comments.
Only approved bots from the list below, to ask if your bot can be added please contact us.
Check for duplicates before posting, duplicates may be removed

Approved Bots

founded 1 year ago

MODERATORS

CAPTCHAs: The struggle to tell real humans from fake. (theconversation.com)

submitted 1 month ago by ModerateImprovement@sh.itjust.works to c/technology@lemmy.world

8 comments fedilink hide all child comments

you are viewing a single comment's thread
view the rest of the comments

[–] FierySpectre@lemmy.world 9 points 1 month ago

In practice, there are several types of CAPTCHAs: text-based, image-based, audio-based and behavior-based.

Computer scientist writing an article about captchas doesn't know that proof-of-work captchas exist.... Such a joke.

Of course those don't do much against automated fake form filling, but against DDoS they're THE solution.

Proof of work (PoW) captchas make the (computing) cost for the attacker exponentially higher than for the website. Basically the website creates a challenge, which has to be solved by the client/attacker before getting access to content. Best of all the website can set the difficulty of the challenge to anywhere from instant to seconds to solve, so normally the users don't even notice it (as it runs in the background) but once someone starts DDoS'ing the difficulty goes up.