Feeds

Croatian brainboxes deploy calculus-based CAPTCHA

Head-scratching puzzler

Security for virtualized datacentres

Boffins at Croatia's Ruđer Bošković Institute are confronting surfers with difficult maths problems as an alternative to conventional CAPTCHA conundrums.

Web users signing up for new accounts are typically asked to decipher the text in a jumbled up image and input the results into a dialogue box. The challenge-response test is designed to frustrate the automation of web service enrollment and needed because, for example, webmail accounts are a useful tool for spam distribution.

Text-based CAPTCHAs are by for the most frequent form of this reverse Turing test, though image-based approaches are sometimes applied.

The Croatian brainboxes, however, have discarded all that by confronting would-be users of a random bit generator service with a difficult calculus conundrum.

calculus_problem

Refreshing the page, however, generates a much simpler problem...

Would-be users of such a service are likely to be cryptographers or others versed in the more obscure mathematical arts, perhaps. The puzzle is perhaps more easily solved by computers than humans.

Especially when, as the Los Angeles Times points out, knowledge engine Wolfram Alpha provides the most efficient approach for most humans towards solving the problem. ®

Secure remote control for conventional and virtual desktops

More from The Register

next story
NASTY SSL 3.0 vuln to be revealed soon – sources (Update: It's POODLE)
So nasty no one's even whispering until patch is out
Russian hackers exploit 'Sandworm' bug 'to spy on NATO, EU PCs'
Fix imminent from Microsoft for Vista, Server 2008, other stuff
Microsoft pulls another dodgy patch
Redmond makes a hash of hashing add-on
'LulzSec leader Aush0k' found to be naughty boy not worthy of jail
15 months home detention leaves egg on feds' faces as they grab for more power
Forget passwords, let's use SELFIES, says Obama's cyber tsar
Michael Daniel wants to kill passwords dead
FBI boss: We don't want a backdoor, we want the front door to phones
Claims it's what the Founding Fathers would have wanted – catching killers and pedos
Kill off SSL 3.0 NOW: HTTPS savaged by vicious POODLE
Pull it out ASAP, it is SWISS CHEESE
prev story

Whitepapers

Forging a new future with identity relationship management
Learn about ForgeRock's next generation IRM platform and how it is designed to empower CEOS's and enterprises to engage with consumers.
Why cloud backup?
Combining the latest advancements in disk-based backup with secure, integrated, cloud technologies offer organizations fast and assured recovery of their critical enterprise data.
Win a year’s supply of chocolate
There is no techie angle to this competition so we're not going to pretend there is, but everyone loves chocolate so who cares.
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?
Intelligent flash storage arrays
Tegile Intelligent Storage Arrays with IntelliFlash helps IT boost storage utilization and effciency while delivering unmatched storage savings and performance.